AP Biology: Unit 7: Natural Selection

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Question 7 · Unit 7: Natural Selection · foundation

An antibiotic kills susceptible bacteria, while bacteria carrying an existing resistance allele survive and reproduce. Which explanation best describes the resulting population change?A. Every bacterium chooses to become resistant.B. The antibiotic creates precisely the mutation each bacterium needs.C. Selection increases the frequency of an existing heritable resistance allele.D. The resistance allele must disappear in the next generation.

Question 15 · Unit 7: Natural Selection · challenge

In a large diploid population at Hardy-Weinberg equilibrium for a two-allele locus, the recessive allele frequency is 0.2. What fraction of individuals is expected to be heterozygous?A. 0.04B. 0.16C. 0.32D. 0.64

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