Test 1 Essays

# Test 1 Essays -...

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http://www.casa.uh.edu/Math/Tools/Calculator.htm Update: Question #11 on 'old exam A' has no best answer--ignore this question The questions: 1) If the assumptions of Hardy-Weinberg equilibrium hold, there are two expected outcomes for a population, one concerning allele frequencies and one concerning genotype frequencies. In class, we learned how to determine if a population is in Hardy-Weinberg equilibrium using the expected genotype frequencies. How could you determine if a population is in Hardy-Weinberg equilibrium using the expectation about allele frequencies? Briefly describe the expectation and the experiment you would use to test it. - You can tell if a population is an H-W equil. If the expected allele frequencies in the next generation is the same as the previous generation, (p’=p; q’=q); i.e. NO evolutions - For instance, in an infinite size population where there is No selection, No mutation, No migration, No genetic drift, and Random mating, then under H-W equilibrium, the population will remain the same and the allele frequencies do not change. 2) What is the population genetics definition of evolution? List two different evolutionary processes that can cause evolution in the PG sense, and describe how they do so. - Population genetics definition of evolution is changes in allele frequencies across generations. - Two different evolutionary processes that can cause evolution in the PG sense are: a) Mutations - which are rare, but can arise spontaneously, which create genetic variation, due to mistakes when replicating DNA. b) Natural selection – is a process by which a trait become more or less common in a population due to hereditary + environment. B/c if there is genetic variation, there is different success rate among those individuals in surviving and reproducing, and then some will pass on more frequently than other. 3)

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Test 1 Essays -...

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