Question

In which condition, the gene ratio remains constant for any species population?

(a) sexual selection

(b) random mating

(c) mutation

(d) gene flow.

Answer 1

The answer is (b) random mating.

In case of random mating the species interbreed which leads to the gene ratio being maintained within the population. In nature however, such type of interbreeding happens within small subpopulations of species which are also known as Mendelian population or deme.

In case of gene flow, the gene ratio keeps changing due to migration.

Mutation is a random process and it does not ensure maintainance of gene ratio at constant levels.

Sexual selection is purely dependent on one gender and there is a competition between the male ornamental genes and fitness gene and thus cannot assure gene ratio being constant.