For two populations to accumulate enough genetic differences to cause speciation,the factors that promote these differences
A) must operate in populations that are not physically separated.
B) must have a greater effect than does the amount of ongoing gene flow.
C) must prevent mutations.
D) should include polyploidy.

Question

Quizplus · Accepted Answer

Gene flow can prevent speciation by reducing the genetic differences between populations. To overcome this, the factors promoting genetic differences (such as natural selection, genetic drift, and mutation) must have a greater effect than gene flow. Therefore, choice B is the best answer. Polyploidy (choice D) can also contribute to speciation, but it is not always necessary. Moreover, choice A is incorrect as physical separation is one mechanism that can facilitate speciation, but it is not the only one. Finally, choice C is incorrect as mutations are necessary for genetic variation and the formation of new traits, which can contribute to speciation.

For Two Populations to Accumulate Enough Genetic Differences to Cause