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Question

In a random mating population in equilibrium, which of the following brings about a change in a gene frequency in a non-directional manner?

A
Mutation
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B
Random drift
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C
Selection
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D
Migration
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Solution

The correct option is A Mutation
In a random mating population in equilibrium, mutations bring about a change in gene frequency. Mutations are non-directional.
Hugo de Vries conducting experiments on Evening Primrose and when he self-pollinated the plants from F1 generation. He found that though the majority of plants are similar to parents, there were a few different plants which appeared at random, in which inherited characters appeared suddenly without any previous indication in the race.
On this basis, he gave the mutation theory
  • mutations appear suddenly but become operational immediately
  • mutations are inheritable
  • do not revolve around normal characteristics of species
  • same type of mutations can appear in the number of individuals of the species

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