AnswersVA-Ecology -CRPR 26-27 MC S1Freshwater and Marine Biomes

Population Genetics Answers

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1
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Which of the following statements is most accurate concerning the founder effect?

A
It increases genetic variation.
B
It is not an example of genetic drift.
C
It results when a small population breaks away from a larger one.
D
It only occurs amongst the Amish.
2
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A species that has experienced a severe bottleneck event would be expected to _______.

A
be better able to adapt to changing environmental pressures
B
have few instances of inbreeding
C
be more susceptible to disease and famine
D
retain significant genetic diversity
3

R-organisms reproduce at a very high rate. Knowing this, why don’t they usually reach their carrying capacity?

A
They live in environments with many predators that feed on them.
B
They are regularly killed off by disease and/or drought.
C
Their life span is too short.
D
a and b only
4

The founder effect is an example of _______.

A
the enhancement of recessive traits
B
genetic drift
C
human reproduction
D
the enhancement of dominant traits
5

The unusual maintenance of genetic diversity among the Mouflon in the Indian Ocean after a severe reduction in their population is mostly due to environmental pressures on the island where they lived.

A
T
B
F
6

Bottleneck events are always caused by the death of most of a species’ population.

A
T
B
F
7

Which respresents the common conditions of all three of the following: genetic drift, the founder principle, and the bottleneck effect?

A
occurs in small populations when one genetic trait becomes more common in a population purely by chance
B
occurs in small populations and results in a decrease in genetic diversity and/or an increase in the occurrence of specific genetic traits
C
when a small group of organisms only reproduce with each other to create a larger population of organisms
D
when the majority of a population is killed off and there are only a few remaining organisms left to rebuild the population
8

Genetic drift is best described as the redistribution of the frequency of gene occurrence in a(n) _______.

A
population
B
organism
C
ecosystem
D
disaster
9

The Amish are an example of a population where the founder effect has resulted in generally rare genetic traits being more commonly expressed.

A
T
B
F
10

The disproportionately high appearance of polydactylism among the Amish suggests that _______.

A
it is a common mutation
B
it is a common birth defect in Pennsylvania
C
it was overrepresented in the gene pool of the original Amish settlers
D
humans are prone to this birth defect

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