Organic Evolution Test #1 H

Does the assumption of Hardy-Weinberg Equilibrium (HWE), by itself, cause evolution (i.e., does it result in a change in allele frequencies)?

• Yes

• No

Nonrandom mating causes genotype frequencies to deviate from expectations under HWE.

• True

• False

According to Figure 7.19, mating in the species Euhadra congenita can only take place between individuals whose shells coil in the same direction.

• True

• False

What is assortative mating?

• Tendency to mate with others of different genotype/phenotype

• Tendency to mate with others of same genotype/phenotype

• Random mating

• Mating among different species

What is the most common form of nonrandom mating?

• Outbreeding

• Inbreeding

• Random mating

• Hybridization

Fill in the blank: Inbreeding is mating among ______ relatives.

• genetic

• distant

• unrelated

• foreign

Refer to the pedigree diagram. The daughter of the mated cousins has two copies of the A1 allele. Both are inherited from the same individual—the cousins’ grandfather. What is this phenomenon called?

• Identity by descent

• Genetic drift

• Linkage disequilibrium

• Epistasis

What is the most extreme form of inbreeding?

• Crossbreeding

• Outcrossing

• Selfing

• Hybridization

Fill in the blank: Selfing leads to dramatic enrichment in _________

• homozygotes

• heterozygotes

• alleles

• mutations

Given the following initial genotype frequencies in snails: A1A1: 250, A1A2: 500, A2A2: 250, what will be the number of A1A2 snails in Generation 1 after selfing?

• 250

• 375

• 500

• 125