Hereditary material essay

So it is wrong to suppose that heredity is the antithesis of variation. “Heredity includes all traits both like and unlike.” It is true that the zygote formed of dogs will develop into a pup and not a lion cub, or a human infant. In spite of adverse circumstances heredity shows itself.

Heredity is an impersonal sort of thing, necessitating the study of the whole family, stock and race.” Again, the environment may be the cause of uniformity, rather than of difference.

“Environment is simply the correlative of heredity; it merely determines which, and to what extent, hereditary trails shall be developed. It is a false belief that a change in environment will lead to a change in heredity, and that these changes are transmissible to off-springs.

“Heredity is a constant factor, established at the time of conception.” It is something innate, the very nature of the organism. Environment, on the other hand, consists of all the changing influences which impinge on the hereditary factor and brings out the potentialities inherent in the zygote.