Class 12 NEET Biology Evolution Questions Part 1

Genetic drift is a change in gene frequency in successive generation of a small population due to chance alone rather than natural selection or gene transfer. The effect of genetic drift on a small population is large as compared to that in the larger population which, owing to its large size and a large number of gametes produced, has a greater probability to accurately represent the allelic frequency of a parental population. An isolated population rules out the possibility of gene flow.