Changes in allele frequencies that are the result of genetic drift result from which of the following mechanisms?

OPTIONS

a.Selective pressures in the environment.



b. Recombination that occurs during meiosis.



c. Introduction of genes from a nearby population.



d. Random sampling in a small population.


QUESTION 5
What effect does crossing-over of chromosomes that results from recombination have on evolution of species?

OPTIONS

It allows for genes to flow between populations, decreasing genetic variability.



Formation of new chromosomes can lead to genetic drift, reducing evolution of new species.



It allows for new combinations of alleles to be passed to offspring, increasing genetic variability.



Genetic combinations and frequency of mutations become increasingly limited.