In humans, brown eyes dominate over blue. A brown-eyed woman whose father had blue eyes.

In humans, brown eyes dominate over blue. A brown-eyed woman whose father had blue eyes. marries a blue-eyed man. Determine the genotypes of the parents and possible offspring.

Let the gene that determines the brown eye color of a person be M, and the gene that determines the development of blue eyes is m.

The father of the brown-eyed woman had blue eyes. He was homozygous for the blue eye gene because the trait is recessive – mm.

He was able to pass on to his daughter only the gene for blue eyes m.

Therefore, the brown-eyed woman is heterozygous – Mm. It is capable of producing two types of oocytes – m and M.

The blue-eyed man she is marrying, like her father, is homozygous. It produces the same type of spermatozoa m.

Probable options for offspring from this marriage:

children with a heterozygous genotype and brown eyes (Mm) – 50%;

children – homozygotes with blue eyes (mm) – 50%.