Question

How many types of gametes are produced by the individual with genotype AA BB CC DD and Aa Bb Cc Dd ?

Answer 1

Number of types of gametes produced by an individual = 2ⁿ

(where n = degree of heterozygosity)

(Heterozygosity - if both the alleles of a character are different)

• AABBCCDD = Since both the alleles of all four genes here are the same (dominant ones) so degree of heterozygosity (n) here = 0

Hence 2⁰ = 1

So only 1 type of gamete is formed here that is ABCD.

• AaBbCcDd = Here every character is expressed by different alleles (Aa, Bb, Cc, Dd - 4 characters) so here value of n = 4

Hence 2⁴ = 16

So 16 types of gametes are formed by this individual (ABCD, aBCD, AbCD, ABcD, ABCd,.abcd etc.)