Co-Dominance (Short Note)

It may be described as phenomenon of inheritance in which both alleles of a contrasting character are dominant and express themselves in heterozygous individual neither masking the effect of one another. In a cross between a tree breeding short horn red cattle and a true breeding white short horn cattle, the offspring have roan colour. A close examination of the skin or roan coloured animal shows that the animal does not possess an intermediate shade of skin colour, but is appears so because of mixture of red hair and white hair. It is clear that none of the two genes is dominant over the other. Such pairs of alleles of a gene are said to be ‘Co dominant’ and the phenomenon as ‘Co Dominance’.