Genetics and Population Dynamics: The Role of Randomness
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Questions and Answers

What is the main assumption made when modeling changes in allele frequency in a very large population?

That the population has a very large number of individuals and therefore randomness does not matter.

What is the result of stochasticity in a small population?

Random deviations in contributions between genotypes, leading to changes in allele frequency.

What is the term for stochastic changes in allele frequencies?

Genetic drift.

Why do neutral alleles change in frequency over time?

<p>Due to genetic drift.</p> Signup and view all the answers

What is the result of modeling a neutral allele in a population with a single self-fertilizing individual?

<p>Polymorphism is lost through genetic drift.</p> Signup and view all the answers

What are some other stochastic measures in evolutionary genetics besides genetic drift?

<p>Mutations, gene flow, founder effects, bottlenecks, and environmental stochasticity.</p> Signup and view all the answers

What is the eventual outcome of genetic diversity in a population when the offspring are produced by random sampling of gametes from the parents?

<p>The eventual outcome is a loss of genetic diversity, resulting in homozygotic offspring.</p> Signup and view all the answers

Under what conditions can genetic drift, resulting in the loss of genetic diversity, occur even in a large population?

<p>When allele frequencies are near 0 or 1, and there are only a few alleles of one type available.</p> Signup and view all the answers

What was the outcome of the experiment using Drosophila melanogaster in 1956?

<p>The populations either lost the brown-eye alleles or fixed them over time.</p> Signup and view all the answers

How does the size of the population affect the rate of genetic drift?

<p>The larger the population, the slower the rate of genetic drift.</p> Signup and view all the answers

What is the ideal condition for studying genetic drift in a population?

<p>An isolated population with no migration.</p> Signup and view all the answers

What is the significance of the experiment using Drosophila melanogaster in 1956?

<p>It demonstrated the effects of genetic drift in a real population, supporting the theoretical predictions.</p> Signup and view all the answers

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