Question

Human skin colour is polygenic trait with each dominant determining a part of melanin deposition while the recessive are coding for no melanin. If a very dark skinned person marries a very light skinned women, the chances of a very dark skinned offspring are

• A. 0
• B. 1/4
• C. 5/8
• D. 1/64

Answer 1

The correct option is D 1/64

Human skin colour is controlled by three pair of genes. So, it is a polygenic inheritance. These three genes present at three different loci and each dominant gene is responsible for the synthesis of fixed amount of melanin. A very dark skinned man (AABBCC) marries very light skinned women, the chances of very dark skinned offsprings are 1 out of 64.

So, the correct answer is '1/64'.