Which respresents the common conditions of all three of the following: genetic drift, the founder principle, and the bottleneck effect?
Answer
A
occurs in small populations when one genetic trait becomes more common in a population purely by chance
B
occurs in small populations and results in a decrease in genetic diversity and/or an increase in the occurrence of specific genetic traits
C
when a small group of organisms only reproduce with each other to create a larger population of organisms
D
when the majority of a population is killed off and there are only a few remaining organisms left to rebuild the population
Explanation
Genetic drift, the founder principle, and the bottleneck effect all involve chance changing the genetic makeup of a population, especially when the population is small. These changes can reduce genetic diversity or make certain traits more common. Choice b describes that shared result. Choices c and d describe particular situations—the founder principle and bottleneck effect—rather than what all three have in common.
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