Biology Now Study Set 1
Quiz 12: Mechanisms of Evolution
A Chance Evolutionary Change Occurring in Small Populations Is Referred
A chance evolutionary change occurring in small populations is referred to as ________.
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If the size of a population drops for at least one generation and causes a loss of genetic variation,a ________ occurs.
Between 1980 and 1999,the Food and Drug Administration (FDA)approved 52 new antibacterial drugs.Only 8 new antibacterial drugs gained approval between 2000 and 2012.The lack of new antibacterial drugs may contribute to the ________ selection of antibiotic-resistant bacteria.
In an original population of 30 mice,the frequency of dark-fur-pigment alleles is 57% and the frequency of white-fur-pigment alleles is 43%. Ten generations later,the population of 30 mice now has 28 dark-fur-pigment alleles and 32 white-fur-pigment alleles? What are the new allele frequencies? Is there evidence of ongoing evolution? Explain.
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