Exam 20: Genes Within Populations

Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72.Women with this waist to hip ratio are also the most fertile.By being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his ____ .

In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.This would lead to ____ in the ancestral giraffe population.

The observation that most pureblood Native Americans have type O blood is best explained by _____

In disruptive selection, over time

Natural selection for a certain phenotype will affect the _____ .

An insect population that becomes resistant to a commonly used insecticide is an example of _____.

Many male songbirds are brightly colored.However, the color of the birds is determined by a balance of

There are more than 30 blood group genes in humans, in addition to the ABO locus.This increases ____ in human populations.

Some flowering plants cannot self-pollinate which increases their tendency to mate with phenotypically different mates, a process called disassortative mating.What effect would this have on a population in Hardy-Weinberg equilibrium?

Being born with extra fingers on a hand is called polydactyly.This is more common in some populations in North America than others due to ____.

The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia.This is probably an example of _____

Assortative and disassortative mating are similar in that both ____

Genotypes are said to be in ___________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

____ would produce the smallest evolutionary change in a given period of time in a population of birds.

If the frequency of an autosomal recessive trait in humans is 1 out of 100 births, what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

When fisheries managers move fish from one lake to another, this causes gene ______.