Genetic Changes Within The Populations : The Consequences Of Selection

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Lab Report 1
Genetic Changes in Populations: The Consequences of Selection
General Biology II Lab
Junyao Li
Introduction
In this lab, we explore the reason genetic changes happened within a population. We use bean-bag model to simulate allele and genotype frequencies for three generations of deer mice under three different selective regimes. Then, we use the Hardy-Weinberg Principle to assess the selection and evolution experienced by deer mice. The Hardy-Weinberg Principle is one of the most important principles in population genetic. G.H. Hardy and W. Weinberg discover it in 1908 independently. Hardy-Weinberg principle states that In a population that is not evolving, allele and genotype frequencies will remain constant from
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Through simulation of varies selection pressure, we could gain an accurate assessment of the impact of selection on deer mice. The purpose of this lab is to learn know how selection changes the genetic makeup in a population. We want to know if different selection pressure would affect genetic makeups in deer mice population. We hypothesized that as selection pressure increase, the frequency of pale coat color deer mice within a population will decrease, and the speed of evolution for the population will increase. Darwin’s natural selection theory, which states that nature would select those who have best adaptation to their environments, lead us to predict that dark coat color deer mice would have better adaptation to their dark habitat, and thus would survive better.

Methods This lab was conducted in Merritt College on June 22, 2015. We use blue color bean to represent dominant allele D, and red color bean to represent recessive allele d. We conduct three simulations, each of which has different selection pressure. We begin each simulation with 100 alleles sample that are randomly drawn form a large gene pool. For the first simulation, there is 0% selection against pale coat color deer mice. We randomly draw two beans out of the 100 alleles sample, and record the genotypes of these two beans on a tally sheet. Then, we put
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