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Definition of Heredity

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  What is Heredity? Heredity is the sum total of the traits gain from through the parents and their ancestors. Those traits are ca...

 

What is Heredity?

Heredity is the sum total of the traits gain from through the parents and their ancestors. Those traits are called heredity.


H.A. Peterson- “Heredity may be defined as what one gets from his ancestral stock through his parents.’’
R.S. Wood-worth- “Heredity covers all the factors that were present in the individual when he begins life, not at birth but at the time
of conception about nine months. before birth.”


Mechanism of Heredity:- In the human body, there are certain germ cells, which are constituted out of innumerable genes. These genes are the real transmitters of heredity factors from one generation to the next. The genetic cell has a rodlike structure and is called the chromosom. It looks like a string or thread and it is the gene which passes, “a gene is the carrier of unit character of a heredity factor which is always transmitted as a unit in all or none fashion.” The chromosomes divide and subdivide like amoeba, increasing from two to four, four to eight and so on. These are referred to as the productive cells. The productive cells from the maternal side is called the ovum while the paternal productive cell is termed the sperm. The ovum and the sperm are cells which contain many pairs of genes. To be precise, the ovum and the sperm contain 23 genes each for the transmission of heredity traits. Some scientists hold the view that, instead of 23 genes each, these cells possess 24 cells each. Maternal and paternal genes union leads to the birth of children and it is this union which determines their heredity also.
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Definition of Heredity
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