Microevolution and Selection Mechanisms

The video tutorial covers microevolution, focusing on population-level changes in allele frequencies over generations. It explains the Hardy-Weinberg principle, conditions for equilibrium, and factors like mutation and recombination that contribute to genetic variation. The tutorial discusses causes of microevolution, including selection, genetic drift, and gene flow, and explores types of natural selection such as directional, disruptive, and stabilizing. It concludes with mechanisms preserving genetic variation, like diploid conditions and balancing selection.

What is the primary focus of microevolution?

• The evolution of ecosystems

• The evolution of individual organisms

• The evolution of populations

• The evolution of entire species

Which condition is NOT required for a population to be in Hardy-Weinberg equilibrium?

• No mutations

• No natural selection

• Large population size

• Non-random mating

What is genetic drift most likely to affect?

• Populations with no mutations

• Large populations

• Populations with high gene flow

• Small populations

Which of the following can introduce new alleles into a population?

• Directional selection

• Stabilizing selection

• Gene flow

• Genetic drift

What type of selection favors the average phenotype?

• Artificial selection

• Directional selection

• Disruptive selection

• Stabilizing selection

In which type of selection does a population split into two distinct forms?

• Stabilizing selection

• Disruptive selection

• Balancing selection

• Directional selection

How does diploidy help maintain genetic variation?

• By promoting non-random mating

• By increasing mutation rates

• By masking recessive alleles

• By allowing only dominant alleles to be expressed

What is an example of heterozygote advantage?

• Individuals with sickle cell trait being resistant to malaria

• Individuals with blue eyes having better vision

• Individuals with long legs running faster

• Individuals with large brains being more intelligent

What is frequency-dependent selection?

• Selection that favors the average phenotype

• Selection that favors the least common phenotype

• Selection that favors the most common phenotype

• Selection that favors the most fit phenotype

Which of the following is NOT a factor that can cause microevolution?

• Mutations

• Genetic drift

• Gene flow

• Stabilizing selection