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 conditions is necessary for a population to be in Hardy-Weinberg equilibrium?

• Natural selection is occurring.

• Mating is completely random.

• The population size is small.

• New mutations are frequently introduced.

If 'P' represents the frequency of the dominant allele and 'Q' represents the frequency of the recessive allele in a population, what is the relationship between P and Q?

• P - Q = 1

• P * Q = 1

• P + Q = 1

• P / Q = 1

In a population, 9% of individuals have dry earwax, which is a recessive trait. What is the frequency of the recessive allele for dry earwax in this population?

• 0.81

• 0.09

• 0.30

• 0.70

If the frequency of the dominant allele (P) for wet earwax is 0.70, what is the frequency of individuals with the homozygous dominant genotype (WW) in the population?

• 0.49

• 0.21

• 0.70

• 0.30