Genetic drift in a population affects the gene pool in which of the following ways?

a. decrease in genetic variation
b. increase in genetic variation
c. increased mutations
d. decreased gene flow

What is thought to have caused the mass extinction at the end of the cretaceous period?

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition. b) one-fourth of the daughters of an affected man would have this condition. c) one-half of the daughters of an affected father and a carrier mother could have this condition. d) only if a woman is xxx could she have this condition.

Are fatty streaks formed by multiple foam cells?