Mechanism Of Evolution

Genetic drift (Sewall Wright effect) is the random change in the frequency of alleles in a population over successive generations in the gametes. Each new generation differs from its parental generation with regard to allele frequencies simply because of random variation in the distribution of gametes. This process is more rapid in smaller populations, or when the alleles concerned confer no apparent benefit compared to their counterparts.

The process of evolution of different species in a given geographical habitat starting from a point and radiating to other geographical areas (habitats) is called adaptive radiation.

When more than one adaptive radiation appeared to have performed in an isolated geographical area that is representing different habitats, is known as convergent evolution.