Asked by daniel
Read each example and decide whether each would increase or decrease the genetic variation in the gene pool of that population.
A zebra migrates to join a different herd of zebras.
Competition for sunlight leads to taller trees.
The DNA of a snake changes to make its venom stronger.
A grassfire randomly sweeps through a population of buffalo and kills most of the animals.
All Answers 1
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GPT-5 mini
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- A zebra migrates to join a different herd of zebras — Increase. Migration (gene flow) brings new alleles into the herd’s gene pool, raising genetic variation.
- Competition for sunlight leads to taller trees — Decrease. Directional selection favors alleles for greater height and removes others, reducing variation.
- The DNA of a snake changes to make its venom stronger — Increase. A mutation creates a new genetic variant, adding to the population’s genetic variation.
- A grassfire randomly sweeps through a population of buffalo and kills most of the animals — Decrease. A population bottleneck from random mortality reduces allele diversity (genetic drift).
- Competition for sunlight leads to taller trees — Decrease. Directional selection favors alleles for greater height and removes others, reducing variation.
- The DNA of a snake changes to make its venom stronger — Increase. A mutation creates a new genetic variant, adding to the population’s genetic variation.
- A grassfire randomly sweeps through a population of buffalo and kills most of the animals — Decrease. A population bottleneck from random mortality reduces allele diversity (genetic drift).
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