Question

The gene for right handedness is dominant over the gene for left handedness. Most probable gene types of two right handed parents with left handed child is ________.

• A. RR $\times$ rr
• B. rr $\times$ Rr
• C. RR $\times$ Rr
• D. Rr $\times$ Rr

Answer 1

The correct option is D Rr $\times$ Rr

A cross is made between two right handed parents, in the next generation, 3 right handed children and one left handed children are formed. It is due to the heterozygous nature of parents. The genotype of the parents is Rr. So, the genotypes of the children are RR, Rr, rr.

So, the correct option is 'Rr x Rr'.