what is gene flow?
o
a. a method of artificial selection
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b. a random change in allele frequencies
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c. when the population drops suddenly, then grows
d. the transfer of genes from one gene pool to another

Which of the following is the main purpose of a human community?

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.