The dominant gene determines the development of the ossified and bent little finger on the hand, which is a known

The dominant gene determines the development of the ossified and bent little finger on the hand, which is a known inconvenience for him. A gene in a heterozygous state causes the development of such a little finger on only one hand. Can a child be born with normal or two abnormal hands in spouses who have a pinky defect in only one hand?

Let’s designate the gene that causes the pathology of the little finger in humans as M, then the gene that, in a homozygous state, causes the normal development of the fingers of the hand will be m.

Heterozygous genotype leading to the development of pathology on only one arm – Mm.

Both spouses have a one-sided pinky defect – Mm. They produce two types of germ cells – m and M.

The theoretically possible offspring of this married couple will be represented by the following options:

children with ossified and bent little fingers on both hands (MM) – 25%;

children with a stiff and bent little finger on one of the hands (2Mm) – 50%;

children without pathology of development of little fingers (mm) – 25%.

Answer: the probability of having a child without pathology is 25%; with pathology on both hands – 25%.