Question 1

The most common source of genetic variation in sexually reproducing organisms is

Accepted Answer

A)  mutation.
B)  recombination of alleles through meiosis and fertilization.
C)  duplication of chromosomes.
D)  duplication of genes.E) B) and D)
F) A) and B)

Question 2

The northern elephant seal was hunted almost to extinction during the 18th and 19th centuries.Less than 100 seals were left to contribute to the gene pool of their future generations.Since the early 20th century,the elephant seals have been protected by law in both the U.S.and Mexico.Over 100,000 seals now inhabit the western shores of North America,all related to the small population that survived the slaughter of hunters. Scientists fear the elephant seals may be more susceptible to disease and pollution due to a ______.

Accepted Answer

A)  a heterozygous advantage
B)  disruptive selection
C)  Founder Effect
D)  Bottleneck EffectE) A) and B)
F) A) and C)

Question 3

If early Viking explorers in Greenland and North America had survived and become the main ancestors of early North American settlers,rather than the mixture of immigrants from across Europe and other continents,today there would be a much higher incidence of Nordic traits in the U.S.population.Such a scenario would demonstrate

Accepted Answer

A)  gene flow from continent to continent.
B)  the bottleneck effect.
C)  genetic drift among the original Viking explorers.
D)  directional selection.
E)  the Founder Effect.F) A) and B)
G) A) and D)

Question 4

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

Accepted Answer

A)  allelic changes in one direction are balanced by changes in the opposite direction.
B)  there is no directional trend in selection of mates since most individuals marry someone.
C)  individuals are not pairing up by chance across the whole population.
D)  this increases gene flow.
E)  we accumulate adaptive traits that improve the population.F) B) and E)
G) A) and B)

Question 5

If the mutation rate of individual genes is taken to be about one in 100,000 genes per cell cycle across many organisms,we might expect evolution to proceed at a consistent rate for various forms of life.Which factor could make the accumulation of gene mutations faster or slower among different organisms?

Accepted Answer

A)  Organisms with more genes will likely have more mutations per generation.
B)  More selection of mutations can occur in a shorter period of time for bacteria that replicate each twenty minutes than for humans with a (roughly) 20-year generation span.
C)  Organisms vary in the proportion of DNA that is active and in the percent of loci that have multiple alleles.
D)  All of the choices are correct.E) B) and C)
F) B) and D)

Exam 16: How Populations Evolve

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

Correct Answer
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The most common source of genetic variation in sexually reproducing organisms is

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Exam 16: How Populations Evolve

Social research indicates that a person is most likely to marry someone from the same village or city,or a high school or college classmate.Therefore,the Hardy-Weinberg equilibrium does not apply well to human populations because

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The most common source of genetic variation in sexually reproducing organisms is

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Correct AnswerverifiedShow Answer

Correct Answer
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