Factors Affecting Genetic Variation-Standard Bio 4.3

Question 1

Predator-prey relationships IncreaseDecreaseX Both

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Both; Complete the T-chart by categorizing each environmental factor as something that would most likely increase or decrease genetic variation. Some answers will fit in both columns depending on the situat: Decrease; Complete the T-chart by categorizing each environmental factor as something that would most likely increase or decrease genetic variation. Some answers will fit in both columns depending on the situat: Both; Complete the T-chart by categorizing each environmental factor as something that would most likely increase or decrease genetic variation. Some answers will fit in both columns depending on the situat: Increase

Question 2

IncreaseDecrease Competition for sunlight leads to taller trees.

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Decrease

Question 3

Toxins IncreaseX DecreaseBoth

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Decrease

Question 4

IncreaseDecrease The DNA of a snake changes to make its venom stronger.

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Increase

Question 5

Disasters IncreaseDecreaseBoth

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Decrease

Question 6

Increased food source IncreaseDecreaseBoth

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Increase

Question 7

mutationgene flowgenetic driftnatural selection A zebra migrates to join a different herd of zebras.

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gene flow; Read each example and identify it with one of the mechanisms that influence gene pools.: gene flow; Read each example and identify it with one of the mechanisms that influence gene pools.: natural selection; Read each example and identify it with one of the mechanisms that influence gene pools.: mutation; Read each example and identify it with one of the mechanisms that influence gene pools.: genetic drift

Question 8

creates new alleles from DNAbrings new alleles from other populationsrandomly selects allelesfavors certain alleles A zebra migrates to join a different herd of zebras.

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brings new alleles from other populations; Read each example and decide what the resulting effect on the gene pool of that population would be.: brings new alleles from other populations; Read each example and decide what the resulting effect on the gene pool of that population would be.: favors certain alleles; Read each example and decide what the resulting effect on the gene pool of that population would be.: creates new alleles from DNA; Read each example and decide what the resulting effect on the gene pool of that population would be.: randomly selects alleles

Question 9

IncreaseDecrease A zebra migrates to join a different herd of zebras.

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Increase; Read each example and decide whether each would increase or decrease the genetic variation in the gene pool of that population.: Increase; Read each example and decide whether each would increase or decrease the genetic variation in the gene pool of that population.: Decrease

Question 10

Describe an environmental factor that could influence natural selection and decrease genetic diversity. Pick a specific example to illustrate your point.

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A pesticide can decrease genetic diversity in an insect population. The pesticide kills susceptible insects, while resistant insects survive and reproduce. Natural selection therefore favors pesticide resistance, reducing the variety of traits in the population.

Factors Affecting Genetic Variation-Standard Bio 4.3 Answers

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