read each example and decide whether each would increase or decrease the genetic variation in the gene pool…

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.

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.

Answer

Brief Explanations:

  1. When a zebra migrates to join a different herd, it brings in new genes, increasing genetic variation through gene - flow.
  2. Competition for sunlight leading to taller trees is natural selection acting on existing variation, not changing the amount of genetic variation in the gene pool.
  3. A change in the DNA of a snake (mutation) creates new genetic material, increasing genetic variation.
  4. A grassfire randomly killing most of a buffalo population is a genetic bottleneck, which decreases genetic variation as many alleles are lost.

Answer:

  1. Increase
  2. No change
  3. Increase
  4. Decrease