Question 1

Which of the following would be expected to produce the smallest evolutionary change in a given period of time in a population of birds?

Accepted Answer

A)  mutation
B)  natural selection
C)  migration
D)  assortive mating
E)  gene flowF) B) and E)
G) A) and B)

Question 2

A restriction in genetic variability caused by a drastic reduction in population size is called a

Accepted Answer

A)  founder effect.
B)  Hardy-Weinberg effect.
C)  bottleneck effect.
D)  polymorphic effect.
E)  adaptive effect.F) A) and B)
G) B) and E)

Question 3

Features that increase the likelihood of survival and reproduction by an organism in a particular environment are called

Accepted Answer

A)  genes.
B)  fitness.
C)  mutations.
D)  adaptations.
E)  selection.F) A) and B)
G) A) and C)

Question 4

The genotype frequencies in a population with no evolution occurring are AA = 0.25,Aa = 0.5,aa = 0.25.By removing all AA individuals before they reproduce and assuming the population will remain under Hardy-Weinberg conditions,what will be the frequency of aa individuals in the next generation?

Accepted Answer

A)  0.25
B)  0.33
C)  0.5
D)  0.67
E)  0.75F) A) and E)
G) B) and D)

Question 5

If the frequency of an autosomal recessive trait in humans is 1 out of 4000 births,what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Accepted Answer

A)  0.00025
B)  0.0158
C)  0.031
D)  0.969
E)  0.984F) B) and D)
G) All of the above

Question 6

What percentage of the enzyme loci of a typical human being are heterozygous?

Accepted Answer

A)  1%
B)  5%
C)  10%
D)  50%
E)  100%F) A) and B)
G) B) and E)

Question 7

In directional selection,over time

Accepted Answer

A)  a population goes extinct.
B)  the most extreme outliers of a population are eliminated (e.g. ,the largest beaks and smallest beaks are eliminated) .
C)  the population is strongly selected for in one direction (e.g. ,larger beak size) .
D)  the population is strongly selected for in two directions (e.g. ,larger beak size and smaller beak size) .
E)  a population increases its variation (E.g. ,a wide selection of all beak sizes) .F) D) and E)
G) A) and E)

Question 8

A locus with more variation than can be explained by mutation is referred to as

Accepted Answer

A)  dominant.
B)  polynomial.
C)  polymorphiC.
D)  heterozygous.
E)  somatic.F) All of the above
G) B) and D)

Question 9

Both extremes of an array of phenotypes are favored.

Accepted Answer

A)  directional selection
B)  stabilizing selection
C)  disruptive selection
D)  guppies with pike cichlids and killifish
E)  guppies with killifishF) B) and C)
G) C) and E)

Question 10

The California populations of the Northern elephant seal are descendants from a very small population of seals that was over-hunted in the 1890s.Heterozygosity in this population would be expected to be ________ due to ________________.

Accepted Answer

A)  slight;a bottleneck effect
B)  slight;the founder effect
C)  great;disruptive selection
D)  great;a bottleneck effect
E)  great;assortive matingF) A) and E)
G) B) and D)

Question 11

The founder principle explains how rare alleles may become more common in new

Accepted Answer

A)  populations.
B)  clines.
C)  bottleneck areas.
D)  migratory areas.
E)  genomes.F) All of the above
G) A) and D)

Exam 20: Genes Within Populations

Both extremes of an array of phenotypes are favored.

Correct Answer
verified

Features that increase the likelihood of survival and reproduction by an organism in a particular environment are called

Correct Answer
verified

The founder principle explains how rare alleles may become more common in new

Correct Answer
verified

The California populations of the Northern elephant seal are descendants from a very small population of seals that was over-hunted in the 1890s.Heterozygosity in this population would be expected to be due to ________.

Correct Answer
verified

A restriction in genetic variability caused by a drastic reduction in population size is called a

Correct Answer
verified

The genotype frequencies in a population with no evolution occurring are AA = 0.25,Aa = 0.5,aa = 0.25.By removing all AA individuals before they reproduce and assuming the population will remain under Hardy-Weinberg conditions,what will be the frequency of aa individuals in the next generation?

Correct Answer
verified

What percentage of the enzyme loci of a typical human being are heterozygous?

Correct Answer
verified

Which of the following would be expected to produce the smallest evolutionary change in a given period of time in a population of birds?

Correct Answer
verified

If the frequency of an autosomal recessive trait in humans is 1 out of 4000 births,what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Correct Answer
verified

In directional selection,over time

Correct Answer
verified

A locus with more variation than can be explained by mutation is referred to as

Correct Answer
verified

Exam 20: Genes Within Populations

Both extremes of an array of phenotypes are favored.

Correct AnswerverifiedShow Answer

Features that increase the likelihood of survival and reproduction by an organism in a particular environment are called

Correct AnswerverifiedShow Answer

The founder principle explains how rare alleles may become more common in new

Correct AnswerverifiedShow Answer

The California populations of the Northern elephant seal are descendants from a very small population of seals that was over-hunted in the 1890s.Heterozygosity in this population would be expected to be ________ due to ________________.

Correct AnswerverifiedShow Answer

A restriction in genetic variability caused by a drastic reduction in population size is called a

Correct AnswerverifiedShow Answer

The genotype frequencies in a population with no evolution occurring are AA = 0.25,Aa = 0.5,aa = 0.25.By removing all AA individuals before they reproduce and assuming the population will remain under Hardy-Weinberg conditions,what will be the frequency of aa individuals in the next generation?

Correct AnswerverifiedShow Answer

What percentage of the enzyme loci of a typical human being are heterozygous?

Correct AnswerverifiedShow Answer

Which of the following would be expected to produce the smallest evolutionary change in a given period of time in a population of birds?

Correct AnswerverifiedShow Answer

If the frequency of an autosomal recessive trait in humans is 1 out of 4000 births,what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

In directional selection,over time

Correct AnswerverifiedShow Answer

A locus with more variation than can be explained by mutation is referred to as

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The California populations of the Northern elephant seal are descendants from a very small population of seals that was over-hunted in the 1890s.Heterozygosity in this population would be expected to be due to ________.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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