Population Genetics

Review Questions

When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms?

  1. natural selection
  2. genetic drift
  3. gene flow
  4. random mating

Hint:

C

Which of the following evolutionary forces can introduce new genetic variation into a population?

  1. natural selection and genetic drift
  2. mutation and gene flow
  3. natural selection and nonrandom mating
  4. mutation and genetic drift

Hint:

B

What is assortative mating?

  1. when individuals mate with those who are similar to themselves
  2. when individuals mate with those who are dissimilar to themselves
  3. when individuals mate with those who are the most fit in the population
  4. when individuals mate with those who are least fit in the population

Hint:

A

When closely related individuals mate with each other, or inbreed, the offspring are often not as fit as the offspring of two unrelated individuals. Why?

  1. Close relatives are genetically incompatible.
  2. The DNA of close relatives reacts negatively in the offspring.
  3. Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes.
  4. Inbreeding causes normally silent alleles to be expressed.

Hint:

C

What is a cline?

  1. the slope of a mountain where a population lives
  2. the degree to which a mutation helps an individual survive
  3. the number of individuals in the population
  4. gradual geographic variation across an ecological gradient

Hint:

D