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Following are key points about the effect of genetic drift:
P. Genetic drift is significant in small populations.
Q. Genetic drift can cause allele frequencies to change in a pre-directed way.
R. Genetic drift can lead to a loss of genetic variation within populations.
S. Genetic drift can cause harmful alleles to become fixed.
Which one of the following combinations of the above statements are true?
P and Q only
P and R only
P, Q and R
P, R and S
Answers (1)
P. Genetic drift is significant in small populations. This statement is true. Genetic drift has a more significant effect in small populations because random sampling has a greater impact on allele frequencies due to the smaller number of individuals.
Q. Genetic drift can cause allele frequencies to change in a pre-directed way. This statement is false. Genetic drift is a random process, and it does not lead to changes in allele frequencies in a pre-directed or deterministic manner.
R. Genetic drift can lead to a loss of genetic variation within populations. This statement is true. Genetic drift can cause the loss of certain alleles from a population due to random sampling. As a result, genetic variation within the population may be reduced over time.
S. Genetic drift can cause harmful alleles to become fixed. This statement is not included in the given options.
Hence, the correct answer is option 2.
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