The original sources of variation coming from . can cause gene frequencies to change in a if the immigrants have gene frequencies compared to the host . Then by genetic that enhance reproduction become and remain more common in successive of a . Under certain conditions, that at one time could may lose that capability, thus their adaptations into particular niches. If continues, it may result in the appearance of new species.

The ultimate source of reproduction is mutation.

(Mutation is the only source to bring variation in genotypic frequencies in a population)

What causes gene frequencies to change in a population if the immigrants have different gene frequencies as against  to the host population is called Migration.

Explanation:

Kindly find an attached image diagrams that explains more of it.

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