Population genetics Essay Example | Topics and Well Written Essays - 500 words

Population genetics - Essay Example The equilibrium is the direct consequence of the segregation of alleles at meiosis in heterozygotes. Numerically, the equilibrium shows that irrespective of the particular mixture of genotypes in the parental generation, the genotypic distribution after one round of mating is completely specified by the allelic frequency p. One consequence of the Hardy-Weinberg proportions is that rare alleles are virtually never in homozygous condition. An allele with a frequency of 0.001 occurs in homomygotes at a frequency of only one in a million; most copies of rare alleles are found in heterozygotes. In general, since two copies of an allele are in homozygotes but only one copy of that allele is in each heterozygote, the relative frequency of the allele in the heterozygotes(as opposed to homozygotes) is: Which for q=0.001 is a ratio 999:1. Thus, the frequency of heterozygote carriers of rare genes that are deleterious in a homozygous condition is much greater than the frequency of the affected homomygotes. In our derivation of the equilibrium, we assumed the allelic frequency p is the same in sperm and eggs.

Personal philosophy of science education in a primary class Assignment

Personal philosophy of science education in a primary class - Assignment Example Students are said to develop their thinking, hand and body skills better under the inquiry-based method of teaching (Akinoglu, 2008). According to Akinoglu, science projects develop the creative thinking skills of students (2008). In teaching science to a primary class, it is important that teaching be done through small group works (Woods-McConney, Wosnitza, & Donetta, 2011). This makes the students more motivated to learn and participate actively in the activity. Another important aspect of teaching science education to primary class students is to help students understand science by linking them to the needs of society (Eady, 2008). They should be made aware of the relevance of science in their daily lives. Lastly, one concurs with McTigue and Slough that design of science texts used should enhance the interests of students to direct their attention to the essential information (2010). Furthermore, science texts should have graphical representations that can assist the students in understanding the science concept presented (McTigue & Slough, 2010). One hopes to apply the philosophies stated above in teaching science to a primary class. These philosophies were based on several theories by science educators and which one deems effective in communicating scientific principles to children. Gilbert, A. (2009). Utilizing science philosophy statements to facilitate K-3 teacher candidates’ development of inquiry-based science practice. Early Childhood Educational Journal , 36 (5), 431-438. Woods-McConney, A., Wosnitza, M., & Donetta, K. (2011, September 1). Keep it positive: Using student goals and appraisals to inform small group work in science. Teaching Science: The Journal of the Australian Science Teachers Association ,

Marketing and Different Vendors Essay Example for Free

Marketing and Different Vendors Essay Having multi-vendor partnerships has its advantages and disadvantages. In the long run, supporting such a partnership would be difficult to maintain. Here are some of the concerns: * Change: Hardware and software requires constant upgrades to keep up with the technology changes. Changes in systems from multiple vendors can cause integration problems and requires a rigid process of testing and configuration. * Knowledge: IT staff must be well-trained in all the systems of the multi-vendor environment. Without a good IT support, the harder it is to find the source of the problem, and the longer it takes for them to resolve it. * Communication: In-house IT staff may have all the knowledge on the systems in the multi-vendor environment, but sometimes support from the vendors is required. In such cases, a support engineer is required to communicate with other support engineer, and it would be easier if it is done within the organization, but this is not usually the case. . Focusing IT on top line requires bringing in revenue for the company by increasing sales, whereas focusing IT on the bottom line requires bringing the cost down by reducing on operating cost. Focusing IT on the top line is more challenging because IT is not able to control who and when someone will actually buy the products and services. On the other hand, focusing IT on the bottom line can be predictable as there are sets of parameters within he organization that can be controlled, for example, reducing the number of employees. 3. Some ways for IT to bring in revenue is by increasing the number of customers and retaining customers. To increase the number of customers, IT systems such as online marketing tools can help to generate sales leads and increase customer awareness by sending out emails or direct mailers to potential customers. Such tools can help in segmenting customer profiles and evaluate the performance of the marketing campaign.

The History Of The Heavyweight Methodologies

The History Of The Heavyweight Methodologies INTRODUCTION Software has become an essential part of human life both at professional and personal end. The development of software has become a chaotic business and is normally cited as the code and fix. In the initial days the software programs were written without much of plan, design and without long term site. This however was fine for the small systems. With the advancement of technology several changes were made and it became difficult to incorporate these changes and it was hard to fix the bugs. This was the result of improper planning. This has led the roots to another alternative, Methodology. This emphasized on the disciplined process of software development to make the whole software development process smooth and predictable. Traditional methods were heavily dependent on documentation, design, work plan and structure making it the way to call it the heavy method. However, this seemed increasingly lengthy and frustrating for few developers who were looking for rapid change. This has resulted in consultants preparing methodologies independently. These methods are known as agile methods. Agile methodology is getting extensive popularity in the industry. This is a mix of accepted and controversial practices. It is the features of the projects such as scope, requirement, resource and size that determine the appropriate methodology that should be used. Thought practicing professionals still emphasise on the importance and usage of heavy methods, the empirical studies are emphasizing on the Agile methods. Heavyweight methodologies Heavyweight methodologies are considered the traditional way of software development. These are based on step by step evolution approach. Several steps in this process include, defining requirement, solution formation, testing and development. In this process it is also mandate to prepare a document that has a set of requirement at the beginning of the project. Waterfall approach: This emphasizes on structured approach. Each stage in this process has a set of actions. These activities much be fulfilled before progressing to the next stage. Each phase is named differently. The first phase determines what the system will be, the second phase determines how the system will be developed. It is in the third stage that the actual coding and designing is started. The developed system is tested in the fourth stage. In the fifth and final stage appropriate training and documentation are provided. In terms of engineering, the term waterfall is used to denote a subsequent or sequential development. Waterfall Model Life Cycle Unified Process (UP) Each activity comprising modelling is divided into workflows in the UP process. This process takes place in an repetitive and incremental manner. In this method the whole process is divided into four phases. The below diagram depicts the stages of this process: Inception At the end of this process the feasibility of the project is determined. The scope of the design is set and a business plan is prepared. Elaboration In this phase, a basic design is made and a plan of structure or construction is made. A risk analysis is also done at this stage. The major risks determined should also be addressed. Construction In the construction phase the system of beta-version is prepared. A well developed system good enough for the preliminary test should also be available in this stage. Transition This is the final stage. In this stage the system is commenced to the stakeholders and end users. The process is considered complete if the stakeholders agree that the objectives mentioned in the inception phase are met. As part of UP there are approximately 50 work items that should be completed. This rigid approach and heavy documentation add a lot of the complexity to the UP. Also, the roles in this process are predefined making it less flexible. Spiral Model This is another heavy model which merges both design and prototype stages trying to combine the benefits of top-down and bottom-up benefits. The four phases in the development model are as follows: Objective setting- In this phase objectives of the project phase are identified. Risk assessment and limitations In this phase key risks are identified and analysed. Information about reducing these risks is also collected in this phase. Development and validation A suitable model is selected for the next phase. Planning The project is reviewed and plans for the next round of spiral are made in this phase. Characteristics of Heavyweight methodologies Heavyweight methodology is known for a long time. This is a very disciplined approach in the software development. Few characteristics of heavyweight methodologies are as follows: Predictive approach: This methodology plans most part of its software development for a longer time. A great emphasis is given to drawing focusing on the needs and measure to answer these needs. Drawings determine how to build the system and act as the basis for the construction process. This also predicts time table and budget for building or constructing the software. Inclusive Documentation: Traditional software development considers the requirements documentation as a key element of documentation. It collects all the customer and stake holder requirements before writing code. Process orientation: The purpose of this method is to allocate or define a process of work that suits the one using it. A process may contain few processes just a manager or a tester can perform. For every task in this method there is a procedure. Agile modelling Agile process concentrates on adding lightness to its processes leading to high quality of software and customer satisfaction. Few of the agile models are as follows Extreme Programming (XP): This has evaluated out of problems raised from traditional systems. This process is known for short cycles of development, incremental planning and continuous feedback, communication leading to evolutionary designing. This methods life cycle is divided into 6 phases i.e. Exploration, Planning, Iterations to release, Production, Maintenance and Death. During the Exploration stage, the client creates story boards about his needs. This is followed by the planning phase in which the story boards are prioritised and a first release schedule is prepared. In the Iteration to Release stage it is the responsibility of development team to create the whole system by continuously testing and integrating the code. In the Production Phase additional testing and performance checks are done. Developments and suggestions detected in this stage are documented for later implementation. Based on this updated releases are made in Maintenance Phase. The final stage is the Death Phase is reached when customer has no more stories to be implemented and the final documentation is prepared. Scrum: Scrum is a repetitive and incremental process of product development. Scrums main focus is on how members should work in order to generate flexibility in a continuously varying environment. At the end of each iteration it makes a set of potential features. In this method it is not compulsory to use any specific software development methods. Key practices in this method are : Product Backlog, Sprints, Sprint Planning, meeting, Sprint Backlog and Daily Scrum. Dynamic System Development method: This is a mixture, and extension for rapid application development and iterative development practices. The basic notion behind this method is to give more importance to time and resources before the functionality of a system. In this method a high emphasis is given to quality. This method has five stages : Feasibility Study: A decision is made about usage of DSDM. This decision is based on project type, organization requirement and people. This stage has two outcomes, 1) feasibility report ii) A prototype plan Business Study: A business study to understand the business aspect of the project. This forms the base for prototype. Functional Model Iteration: This phase includes analysis, coding and prototypes. The output of this stage is a prototype code and analysis models. Design and build iteration: Main system is built in this stage. The prototypes are reviewed and developments are made based on user comments. Implementation: This is the final stage where the project is handed over to the user. Appropriate training is also provided. Characteristics of agile methodologies People oriented: All the stakeholders. i.e. customers, developers, users and end users are very important in this methodology. Adaptive: This methodology is preferred by those who are open to change and are flexible. Balancing Flexibility and Planning: Though planning is important, a trial and error method is followed in this approach as it is hard to predict the right things in the initial stage of software development. Simplified process and small groups: A simple process of concentrating on the present rather than the future is the motto of Agile process. It also maintains small teams and any communication is provided to the whole team. Comparison Traditional heavy methodology for software development is prevailing successfully for a long time now. However, it has several disadvantages such as inflexibility and high time consuming etc. Taking these drawbacks in to account a new system was developed which is Agile. Both the methodologies i.e. (agile and heavy weight) have their advantages and disadvantages. People usually use one of these methods based on the feasibility. A Summary of difference in agile and heavyweight is shown in the following table. There are important factors influencing the decision and selection methodology, which is suitable for different conditions. These factors can be divided into the size of the project, people and risk Project size: One of the major limitations in this process is size of the project. The important elements in this process are budget, time span of the project and team organization. A huge project needs huge team and huge budget. This in turn requires better co-ordination and better communication. Heavy methodology provides this by a thorough planning, design and documentation. However, this is not possible in case of Agile process. According to Alistair A light process needs few people in contrary to the heavy method where more people are required. A major limitation of agile methods is the size of the project. Main elements of the same are budget, duration of projects and organization of the project team. The larger unit or a larger budget, you need the larger project. Thus, requires a compilation of more demands, requirements of more people and better coordination. Heavyweight support this methodology by providing planning, documentation and processes for better communication and coordination in large groups. Fewer people are needed if the methodology used is lighter. However, more people will be needed if the heavier methodology (Alistair Cockburn, 2003). The larger group also has its impact on communication in the design and performance. The methodology is a matter of coordination and management of human communication. This implies that the level of methodology must be increased if the numbers of people increase. This makes it even more difficult to use agile methods with large groups. However, Ken Schwaber (one of the deve lopers of SCRUM) argues that large groups can be broken down into small teams using the dimensions of the scrums. Project duration is another factor in the choice of methodology. Heavyweight methodology needs a lot of extra time for output such as documentation, design documentation, writing, analysis etc. Therefore, it can be concluded that when time is short agile development methodologies would be the best option. People Factor: The Agile methodology gives very much importance to stakeholders i.e. it concentrates on peoples factor. This methodology makes sure that experienced people and skilled people are part of the process. Experts who are part of the team provide continuous feedback about the effects that the use may face in selecting the project. As part of this process the customer also gets a right to check progress and change the direction of development at any stage or iteration. This is one of the main features that make the agile process more attractive than the heavy process. Organizational culture is another important factor while choosing the methodology. If any organization is not open to change and is inflexible, An agile process cant be used there. Risk Factor: An important risk factor in the software development is how it responds to change. Agile methods can be used in case of applications that should be built quickly and dont have any quality hurdles. If the project is critical and requires several quality layers then the traditional system is appropriate. Improper definition may lead to several defects. Agile methodologies help in developing short term projects and give importance to customer reviews. Conclusion I would like to end it by saying that heavy methodology consisted of severe methods of comprehensive planning, design documentation.. Heavy thoughts that accompany them will be taken over by the agile movement not in the distant future. The need for Heavyweight approaches still prevails in large, long-lived projects that have specific security, reliability and security requirements. However, business needs to respond quickly to the environment in innovative, cost-effective and efficient manner is increasing the need to use agile methods of software development.

Uniforms In School :: essays research papers

Uniforms In School Uniforms should definitely be used in school systems. Everything about it makes sense. Not everyone is going to be happy about it at first, but they will slowly but surely adjust. Uniforms free students of the stress on what to wear in the morning. I usually have that problem, as well as my brother. Uniforms also relieve the tension, or "break the ice", when new students come in, since they will be wearing the same thing. This will benefit both the new student and the class as a whole. The uniforms will build a sense of unity within the school. Instead of everyone as a separate "team", everyone will be in the same "team". This will benefit the whole school. Uniforms free students of the stress on what to wear in the morning. Many students, including myself, stand in front of their closets and just stare, trying to decide on what kind of shirt to wear as well as what kind of pants or shorts. The uniforms will speed up the morning "getting-up" process, thus reducing tardiness in school that I know is a problem in my first period class. The enforcement of uniforms will relieve the tension between the new students and the students that are already there. The uniforms will expedite the process of making new friends for the new student since the uniforms will help the new student feel a sense of "belonging". This helps the majority of the school becoming friends with each other. This obviously helps the class and also the school as a whole, as there will be less fights and controversy between students. Uniforms will build a sense of unity within the school. The students will feel they are a part of one whole team charging toward their ultimate goal: graduation and college. The sense of unity will bring more fans and support for sports events and help the school financially.

Putting a Stop to Smoking Essay -- Tobacco Education Prevention

It is shocking to know that there are about ten people who die from smoking every single minute, and nobody seems to have any idea about it. Indeed, there is â€Å"a growing gap between the real world and the academy† since people are more intellectual about things that are irrelevant to the real life and are ignorant of things that are imperative to live in the real world (Orr 310). Did you know that there are over four hundred thousand deaths caused by cigarettes and tobacco each year in the U.S. alone? That makes it about five million deaths worldwide each year, according to â€Å"Statistics about Smoking.† Smoking is notorious for causing avoidable diseases and deaths, and yet not many institutions have develop an appropriate system to prevent cigarette and tobacco from killing millions each year. For instance, all universities promote health and wellness and many claim to be substance-free, yet they do not restrict the selling of cigarettes and tobacco in camp us stores or smoking on campus. People are dying, thousands are getting hooked, and a whole population is being affected, hence it‘s urgent that a university aims to educate students to combat smoking. The ideal student will learn the immediate and long-term affects of what cigarette can do to himself and others around him, to resist peer pressure, and be capable of recognizing and resisting advertisement and media ploys. In order to achieve this, the university must provide a curriculum that includes classes such as Anatomy, Smoking Biology with seminars, Media Effects, History of Smoking, Tobacco Industry 101, and DARE with community service. Many people are not aware of the many ways cigarette or tobacco use can harm them and others around them because they have never... ...its students to spread their knowledge. The classes that a university provide should enable the ideal students to learn the immediate and long-term effects of tobacco use, and to recognize and resist both peer pressure and media ploys. More importantly, they must also enable students to share their knowledge with society and help others, so that the entire population can effectively combat smoking together by preventing people from puffing their lives away. Works Cited Martin, Terry. "Global Smoking Statistics." Quit Smoking | Quit Smoking Support | Smoking Cessation. The New York Times Company, 28 Jan. 2007. Web. 26 Oct. 2010. http://quitsmoking.about.com/cs/antismoking/a/statistics.htm. "Statistics about Smoking - WrongDiagnosis.com." Wrong Diagnosis. Health Grades Inc., 2010. Web. 31 Oct. 2010. http://www.wrongdiagnosis.com/s/smoking/stats.htm.

Cost of Goods Checkpoint Essay

A multi-step income statement for a trading business highlights the fact that between 40% and 60% of revenue from sales is accounted for as the cost of goods sold. The cost of goods attributed to a company’s products is expensed as the company sells these goods. There are several ways to calculate COGS but one of the more basic ways is to start with the beginning inventory for the period and add the total amount of purchases made during the period then deducting the ending inventory. (According to Kimmel, Weygandt, and Kieso), cost of goods sold is found by taking the cost of goods available for sale (beginning merchandise inventory + net purchase), less the ending merchandise inventory (p. 244). In a wholesale or retail trading business, merchandise held for resale in the normal course of business is the largest asset owned by the organization. For this reason it is vital that accurate up-to-date records be maintained when goods are acquired and inventories taken. Finished goods and or merchandise makes up cost of goods sold. There are two classifications of inventory: merchandiser or manufacturer. In a merchandiser company inventory consists of many items all different. Whereas, a manufacturer, some inventory may not be ready (Kimmel, Weygandt, & Kieso, p. 282). Examples of items that make up cost of goods include; produce, clothing, electronics, items that can be resold from manufacture to a company to the customer. This means when the business acquires a finished product, the cost of the product goes into an inventory asset account. The customer will then purchase the product, finished good, the business transfers the cost of the product from the inventory asset account to the cost of goods sold expense account because the product is no longer in the business’s inventory (Kimmel, Weygandt, & Kieso, p. 282). References Kimmel, P. D. , Weygandt, J. J. , & Kieso, D. E. (2011). Financial accounting: Tools for business decision making (6th ed. ). Retrieved from The University of Phoenix eBook Collection database