7. Heredity & Evolution
It is the formation of new species from an existing one due to reproductive isolation of a section of its population.
Development of reproductive isolation is basic to formation of new species. This can occur by the following methods
Physical Barrier :
A physical barrier like valley, mountain, water body, etc. develop between two populations of a species.
Two Ends of Long Range :
Subpopulations at the two ends of a long range seldom interbreed.
A large mutation can make some members reproductively isolated from the rest.
Genetic Drift (Wright Effect) :
It is random change in gene frequency that occurs in a small population due to fixation of certain alleles and elimination of others.
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