In humans, myopia dominates over normal visual acuity.

In humans, myopia dominates over normal visual acuity. A heterozygous myopic woman marries a man with normal visual acuity. What kind of children can you expect from such a marriage?

Let us designate the gene that causes myopia-type vision pathology in humans as D, then the gene that causes the development of normal visual acuity will be designated as d.

Conditionally heterozygous woman with myopia – Dd, she produces two types of eggs – D and d.

Her husband has normal visual acuity – dd, because the recessive trait is realized phenotypically only if the genotype is homozygous. This man produces sperm of the same type d.

The offspring possible for a given married couple are represented by the following options:

children with normal visual acuity (dd) – 25%;

homozygous children with myopia (DD) – 25%.

children – heterozygotes with myopia (Dd) – 25%.

The probability of having a child with myopia is 75%, a child with normal vision – 25%.