The mother has a 4 blood group, Rh negative, the father has a 2 blood group, Rh positive

| March 14, 2021 | education

The mother has a 4 blood group, Rh negative, the father has a 2 blood group, Rh positive (heterozygous for both characteristics). Determine the likelihood of having a child with a 3 blood group and a negative rhesus

The mother has genotype IA IB rr, because the Rh-negative genotype must be homozygous for the recessive gene that causes this trait. This woman is capable of producing two types of eggs – IB r, IA r.

The diheterozygous father has the genotype IA I0 Rr and produces four types of spermatozoa – IA R, I0 r, IA r, I0 R.

The offspring of this married couple are represented by the following possible options:

Rh-positive children with blood group IV (IA IB Rr) – 12.5%;

Rh-negative children with blood group III (IB I0 rr) -12.5%;

Rh-negative children with blood group IV (IA IB rr) – 12.5%;

Rh-positive children with blood group III (IB I0 Rr) – 12.5%;

Rh-positive children with blood group II (IA IA Rr) – 12.5%;

Rh-negative children with blood group II (IA I0 rr) – 12.5%;

Rh-negative children with blood group II (IA IA rr) – 12.5%;

Rh-positive children with blood group II (IA I0 Rr) – 12.5%.

Answer: 12.5%.



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