A) Natural selection
B) Adaptation
C) Genetic drift
D) Gene mutation
Correct Answer: D
Solution :
Some of the sources of genetic variability in a gene pool of population are mutation, recombination of gene, gene migration, genetic drift and natural selection. Out of them gene mutation are invisible change in chemical nature of a gene and changes the sequence of nucleotide in DNA. Although rate of mutation is very low but is sufficient to produce considerable genetic variability. In genetic drift (due to epidemics or migration or Sewell wright effect) non-random mating increase the chance of variations.
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