Factors Affecting Genetic Variation

Question 1

Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.

Revolt · Accepted Answer

Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.: Genetic drift; Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.: Both; Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.: Genetic drift; Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.: Gene flow; Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.: Gene flow

Question 2

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 situation.

Revolt · Accepted Answer

B: ✔ Decrease

Question 3

Read each example and decide what the resulting effect on the gene pool of that population would be.

Revolt · Accepted Answer

B: ✔ brings new alleles from other populations

Question 4

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

Revolt · Accepted Answer

A: ✔ Increase

Question 5

Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation.

Revolt · Accepted Answer

B: ✔ Genetic drift

Question 6

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

Revolt · Accepted Answer

One environmental factor that can influence natural selection and decrease genetic diversity is a severe, prolonged drought. This environmental change acts as a selective pressure, favoring individuals with specific traits that allow them to survive in arid conditions—such as plants with extremely deep root systems or animals with high water-retention capabilities. Individuals that lack these specific adaptations are less likely to survive and reproduce. As a result, the alleles responsible for the less-favorable traits are removed from the population's gene pool, which narrows the overall genetic variation. A specific example occurred with Darwin's finches on the island of Daphne Major; during a severe drought, finches with smaller beaks were unable to crack the large, hard seeds that were the only remaining food source. This led to a significant decrease in the population of small-beaked finches, reducing the genetic diversity of beak sizes within that population.

Question 7

Which of the following did you include in your response?

Revolt · Accepted Answer

A: predator-prey relationships; B: competition; C: toxins; D: disaster; E: selection favors certain traits and decreases genetic variation

Question 8

Competition Increase✔ DecreaseX Both

Revolt · Accepted Answer

B: ✔ Decrease

Question 9

creates new alleles from DNAbrings new alleles from other populationsrandomly selects alleles✔ favors certain alleles Competition for sunlight leads to taller trees.

Revolt · Accepted Answer

D: ✔ favors certain alleles

Question 10

Increase✔ Decrease Competition for sunlight leads to taller trees.

Revolt · Accepted Answer

B: ✔ Decrease

Factors Affecting Genetic Variation Answers

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