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.
Competition Increase✔ DecreaseX Both
Toxins IncreaseX Decrease✔ Both
New habitat X IncreaseDecrease✔ Both
Disasters Increase✔ DecreaseBoth
Increased food source ✔ IncreaseDecreaseBoth
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.
Read each example and decide what the resulting effect on the gene pool of that population would be.
Read each example and decide whether each would increase or decrease the genetic variation in the gene pool of that population.
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.
Describe an environmental factor that could influence natural selection and decrease genetic diversity. Pick a specific example to illustrate your point.
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.
Which of the following did you include in your response?
creates new alleles from DNAbrings new alleles from other populationsrandomly selects alleles✔ favors certain alleles Competition for sunlight leads to taller trees.
Increase✔ Decrease Competition for sunlight leads to taller trees.
Gene flowGenetic drift✔ Both is a mechanism for evolution
✔ creates new alleles from DNAbrings new alleles from other populationsrandomly selects allelesfavors certain alleles The DNA of a snake changes to make its venom stronger.
✔ IncreaseDecrease The DNA of a snake changes to make its venom stronger.
Gene flow✔ Genetic driftBoth is often related to disasters
creates new alleles from DNAbrings new alleles from other populations✔ randomly selects allelesfavors certain alleles A grassfire randomly sweeps through a population of buffalo and kills most of the animals.
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