Population Genetics

____ is the evolutionary change that occurs over geologic time above the species level.

• Microevolution

• Macroevolution

• Individual variation

• None of the above

Which kind of evolution occurs over a relatively short period of time within a population or species?

• Individual evolution

• Microevolution

• Macroevolution

• None of the above

A _____ ______ consists of all the genes of all the members of the population

A gene ______ is all the alleles of all the genes of all the individuals of a population.

Microevolution occurs over geologic time above the level of the species.

• True

• False

In a population of 100 individuals, 80 have the dominant phenotype. Of those 80, 40 are homozygous. How many recessive alleles are in the gene pool?

• 80

• 20

• 60

• 40

Answer explanation

100 total individuals (given)

DOMINANT PHENOTYPE

80 dominant individuals (given)

40 homozygous (given)

80-40 = 40 heterozygous

so 40 recessive alleles

RECESSIVE PHENOTYPE

100 total - 80 dominant = 20 recessive individuals

Homozygous, so 20 x 2 = 40 recessive alleles.

Individuals do not evolve.

• True

• False

The genes of an individual do not change over time.

• True

• False

For a given gene, the population is characterized by the frequency of different alleles in the gene pool.

• True

• False

A population of 300 sparrows has 150 individuals with red beaks (RR), 60 individuals with brown beaks (rr), and 90 individuals with reddish-brown beaks (Rr). What is the allele frequency of allele r in the population?

Mathematical Equivalence

ON