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.... 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.
Understand the Problem
The question is asking to determine whether each of the provided scenarios increases or decreases genetic variation in a gene pool. This involves understanding concepts related to genetic variation and population dynamics.
Answer
Increase, No change, Increase, Decrease
Migration of a zebra increases genetic variation. Competition leading to taller trees does not directly change it. A snake's DNA changes (mutation) increase variation. The grassfire decreases it.
Answer for screen readers
Migration of a zebra increases genetic variation. Competition leading to taller trees does not directly change it. A snake's DNA changes (mutation) increase variation. The grassfire decreases it.
More Information
Migration introduces new genes; mutations create genetic diversity. Phenotypic changes like taller trees don't add genetic variation. Disasters reduce potential gene combinations.
Tips
Avoid assuming that adaptation or phenotype changes directly change genetic makeup. Not all environmental events impact the gene pool equally.
Sources
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