Can a blue-eyed child with a first blood group be born from the marriage of a blue-eyed woman

Can a blue-eyed child with a first blood group be born from the marriage of a blue-eyed woman with a 1st blood group and a brown-eyed man with a 4th blood group, whose mother had blue eyes? Determine the genotypes of the parents and children.

As a rule, the gene for brown eyes in humans dominates over the gene for blue eyes. Let’s designate the gene for blue eyes as c, then the gene for brown eyes will be designated as C.

A woman with blue eyes will be homozygous for eye color, because this is a prerequisite for the realization of a recessive trait in her phenotype.

It has the genotype I0 I0 cc and produces oocytes of the same type I0 c.

The mother of the brown-eyed man also had the cc genotype homozygous for the gene for blue eyes and could only pass on the recessive gene to him. Consequently, a man is heterozygous for eye color. It has the genotype IA IB Cc and produces four types of spermatozoa – IA C, IB c, IA c, IB C.

The offspring of the described male and female will include the following possible options:

children with blood group II and brown eyes (IAI0 Сс) – 25%;

children with blood group III and blue eyes (IBI0 cc) – 25%;

children with blood group II and blue eyes (IAI0 cc) – 25%;

children with blood group III and brown eyes (IB I0 Сс) – 25%.

A child with blue eyes can be born from this pair, but not with blood group I. Because the I blood group is due to the I0 I0 genotype, and the father with the IV group does not produce type I0 spermatozoa.