Population Genetics: When Darwin Met Mendel - Crash Course Biology #18

What is the main focus of population genetics?

• How individual organisms change over their lifetime.

• How populations of a species change genetically over time.

• The study of how different species interact in an ecosystem.

• The process of creating new species from existing ones.

What is allele frequency, and why is it important in understanding evolution?

• It's the number of genes an individual has, important for individual health.

• It's how often certain alleles appear in a population, central to how evolution happens.

• It's the rate at which new species are formed, showing the speed of evolution.

• It's the total number of organisms in a population, indicating its size.

What is genetic drift?

• The movement of genes between different populations.

• Changes in allele frequency due to random chance.

• The process where individuals choose mates based on specific traits.

• The survival and reproduction of individuals best adapted to their environment.

Which of the following is NOT one of the five factors that can change allele frequency within a population?

• Natural selection

• Sexual selection

• Genetic engineering

• Mutation

Which of the following is a condition for a population to be in Hardy-Weinberg equilibrium?

• Natural selection is occurring

• Individuals choose their mates

• The population size is very large

• New alleles are introduced through mutations

In the Hardy-Weinberg principle, what do 'p' and 'q' represent?

• The frequency of two different genotypes

• The frequency of two different alleles

• The total number of individuals in a population

• The rate of mutation and gene flow

What does the Hardy-Weinberg equation p^2 + 2pq + q^2 = 1 represent?

• The sum of all allele frequencies in a population

• The frequencies of different genotypes in a population

• The rate of genetic drift over time

• The number of mutations in a gene pool

If 9% of a population has dry earwax (a recessive trait), what is the frequency of the recessive allele (q)?

• 0.09

• 0.30

• 0.70

• 0.49