Describe the four microevolutionary forces that lead to changes in allele frequencies across generations (2 pts each). In the description for each indicate whether the force supplies new variation or alters existing variation and whether the force is expected to increase or decrease variation within populations. Rank the forces in terms of the amount of time required to cause changes in allelic variation (2 pts).
Added by Gonzalo S.
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**Mutation**: Mutation is a random change in the DNA sequence that can create new alleles. It is the ultimate source of new genetic variation in a population. Mutations can be beneficial, neutral, or harmful, and their effects on the population depend on the Show more…
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Adi S.
1. What 2 factors are most commonly responsible for decreases in genetic variation? 2. What effect would increasing gene flow between 2 populations have on their gene pools? 3. New genetic information (alleles) can be introduced into a population through what mechanisms? 4. A population of what kind of organism would most closely resemble an equilibrium population that is not evolving? Explain why you think so (Hardy- Weinberg conditions).
Madhur L.
Match the appropriate evolutionary force with the effects on allele frequencies over time in a population. Mutation acting alone as a force will cause changes in allele frequencies very quickly. Migration leads to homogenization between populations with increased gene flow. Genetic drift only causes allele frequency changes in very small populations. Selection is the result of bottleneck events.
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