Chapter 23: the Evolution of Populations

6020 Words Feb 5th, 2013 25 Pages
Biology, 7e (Campbell)
Chapter 23: The Evolution of Populations

Chapter Questions

1) What is the most important missing evidence or observation in Darwin's theory of 1859?
A) the source of genetic variation
B) evidence of the overproduction of offspring
C) evidence that some organisms became extinct
D) observation that variation is common in populations
E) observation that competition exists in populations
Answer: A
Topic: Concept 23.1
Skill: Knowledge

2) Which hypothesis of inheritance, common at Darwin's time, caused many to question the ability of natural selection to bring about adaptation in populations?
A) particulate hypothesis
B) blending hypothesis
C) chromosomal hypothesis
D) nucleic acid hypothesis
E)
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What is the percentage of the population that is heterozygous for this allele?
A) 3
B) 9
C) 21
D) 30
E) 42
Answer: E
Topic: Concept 23.1
Skill: Application

12) In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.2. What is the frequency of individuals with Aa genotype?
A) 0.20
B) 0.32
C) 0.42
D) 0.80
E) Genotype frequency cannot be determined from the information provided.
Answer: B
Topic: Concept 23.1
Skill: Application

13) In a population with two alleles, A and a, the frequency of a is 0.50. What would be the frequency of heterozygotes if the population is in Hardy-Weinberg equilibrium?
A) 1.00
B) 0.75
C) 0.50
D) 0.25
E) 0.10
Answer: C
Topic: Concept 23.1
Skill: Application

14) Most copies of harmful recessive alleles in a sexual species are carried by individuals that are
A) haploid.
B) polymorphic.
C) homozygous for the allele.
D) heterozygous for the allele.
E) B and C
Answer: D
Topic: Concept 23.1
Skill: Knowledge

15) In a population with two alleles, A and a, the frequency of A is 0.2. Organisms that are homozygous for A die before reaching sexual maturity. In five generations, what would be the frequency of individuals with aa genotypes?
A) less than 0.04
B) 0.04
C) 0.32
D) 0.64
E) greater than 0.64
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