AP Bio Unit 2 Review Study Guide Questions and Correct Answers
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NU1426
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NU1426
AP Bio Unit 2 Review Study Guide Questions and Correct Answers
Which statement about natural selection is most correct?
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects. Which of these would have b...
AP Bio Unit 2 Review Study Guide Questions and
Correct Answers
1). Which statement about natural selection is most correct?
Ans: Well-adapted individuals leave more offspring, and thus contribute more to the
next
generation's gene pool, than do poorly adapted individuals.
2). Ddt was once considered a "silver bullet" that would permanently eradicate insect pests.
today, instead, ddt is largely useless against many insects. which of these would have been
required for this pest eradication effort to be successful in the long run?
Ans: None of the individual insects should have possessed genomes that made them
resistant to DDT.
3). Which of the following pieces of evidence most strongly supports the common origin of all
life on earth?
Ans: All organisms use essentially the same genetic code.
4). The theory of evolution is most accurately described as
Ans: an overarching explanation, supported by much evidence, for how populations
change over time.
5). Which of these is a statement that darwin would have rejected?
Ans: The smallest entity that can evolve is an individual organism.
6). Which definition of evolution would have been most foreign to charles darwin during his
lifetime?
Ans: change in gene frequency in gene pools
7). Which of these evolutionary agents is most consistent at causing populations to become
better suited to their environments over the course of generations?
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, Ans: Natural selection
8). Each of the following has a better chance of influencing gene frequencies in small
populations than in large populations, but which one most consistently requires a small
population as a precondition for its occurrence?
Ans: Genetic drift
9). In a hardy-weinberg population with two alleles, a and a, if the frequency of the allele a is
0.4. what is the percentage of the population that is homozygous for this allele?
Ans: 16
10). In a hardy-weinberg population with two alleles, a and a, if the frequency of allele a is 0.2.
what is the frequency of individuals with aa genotype?
Ans: 0.32
11). A large population of laboratory animals has been allowed to breed randomly for a number
of generations. after several generations, 25% of the animals display a recessive trait (aa),
the same percentage as at the beginning of the breeding program. the rest of
the animals show the dominant phenotype, with heterozygotes indistinguishable from the
homoygous dominants. what is the estimated frequency of allele a in the gene pool?
Ans: 0.50
12). A large population of laboratory animals has been allowed to breed randomly for a number
of generations. after several generations, 25% of the animals display a recessive trait (aa),
the same percentage as at the beginning of the breeding program. the rest of the animals
show the dominant phenotype, with heterozygotes indistinguishable from the homozygous
dominants. what proportion of the population is probably heterozygous (aa) for this trait?
Ans: 0.50
13). In a certain flock of sheep, 4% of the population has black wool and 96% has white wool.
assume that the population is in hardy-weinberg equilibrium. if black wool is a recessive
trait, what percentage of the population is heterozygous for this trait?
Ans: 32%
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