he diagram below shows two populations of organisms that have been long-separate
ID: 252681 • Letter: H
Question
he diagram below shows two populations of organisms that have been long-separated by a river which prevents interbreeding. The two populations differ in coloration, as shown in the diagram. Recent human activity has caused the river to dry, however, resulting in the two populations shown in the lower diagram. What is the most likely explanation for this change?
a
an increase in gene flow between the two populations
b
a decrease in gene flow between the two populations
c
an increase in non-random mating between the two populations
d
a decrease in non-random mating between the two populations
2005 Population 1 Population 2 River Human disturbance of river 2005 2015 Population 1 Population 2 River I O Purple coloration O Yellow coloration O Blue colorationnExplanation / Answer
Answer: option a: an increase in gene flow between the two populations.
Gene flow is the movement of genes/genetic material from one population into another resulting in evolution. Gene flow occur due to migration of populations and addition or loss of people can cause changes in the gene pool frequencies.
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