Heredity

Heredity refers to a Biological Mechanism as a result of which a child obtains something in terms of specific species (or) Ancestral characterstics by which he can trace his individuality from his ancestral stock through his parents.

Heredity,thus contributes in the form of inheritance just as we inherit land,money and other assets (or) liabilities from our parents and forefathers.Now the question may arise,when does a child inherit the specific ancestral characterstics.

Human Life thus starts from a single cell produced by the union of germ cells,one form each parent and gradually develops into a complicated composition of trillions of body cells and yet containig the same genetic material as was inherited at the time of conception.

The Zygote (i.e) fertilized ovum consists of a semi-fluid mass called Cytop lasm and within the cytoplasm there is a nucleus which contains the chromosomes.Chromosomes always exist in pairs.In human zygote there are 23 pairs of chromosomes (46 Individual Chromosomes),23 pairs of which are contributed by the father and 23 by the mother and this is why for the transmission of herditary characterstics both mother and father are said to be equal partners.

Chromosomes possess a thread like structure and are made up very small units called "Genes".It is estimated that there are more than 1000 genes in each human chromosome cell.Consequently the possibility regarding the combination of 30,000 characterstics each mother and father,may help us to understand well the uni-genes of each individual.