In a random mating population in equilibrium, which one of the following brings about a change in gene frequency in a non-directional manner?
(a) mutations
(b) random drift
(c) selection
(d) migration
Answer:
b). Random drift
Explanation:
The gene frequencies are conserved from one generation to the other under certain conditions. The conditions include absence of mutations, selection, migration and random drift. We know that these conditions are never fulfilled. Therefore, in a large panmictic (random mating) population, changes in gene frequencies do occur. This change can either be directional as in the case of mutation, selection or migration, or can be non-directional as in the cases of random drift.
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