The mother has a positive Rh factor, and the father has a negative one. What Rh factor will their children have

| May 5, 2021 | education

The mother has a positive Rh factor, and the father has a negative one. What Rh factor will their children have: a) if the mother’s genotype is homozygous, b) if the mother’s genotype is heterozygous.

The Rh factor is a trait localized in the autosome. The positive Rh factor dominates.

Rh + – positive, Rh- – negative.

Therefore, the father is homozygous for the recessive allele, his genotype is Rh-Rh-.

1) If the mother is homozygous, then her genotype is Rh + Rh +. Crossing in this case looks like this:

Parents: Rh + Rh + x Rh-Rh-,

Gametes: Rh + x Rh-,

Children: Rh + Rh-. All are Rh positive.

2) If the mother is heterozygous, then her genotype is Rh + Rh-.

Parents:

Parents: Rh + Rh- x Rh-Rh-,

Gametes: Rh +, Rh- x Rh-,

Children: Rh + Rh-, Rh-Rh-.

The ratio is 1: 1.



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