For one child Rh-negative and blood group 0, two parental pairs apply: a / mother is Rh-negative with blood group 0

| July 4, 2021 | education

For one child Rh-negative and blood group 0, two parental pairs apply: a / mother is Rh-negative with blood group 0, father is Rh-positive with blood group AB. Which parental pair does the child belong to?

Blood group 0 in humans is due to the genotype I0 I0.

The negative Rh factor in human blood is due to the rr genotype homozygous for the recessive gene.

Consequently, the child has the genotype I0 I0 rr.

A woman with Rh negative blood and blood group 0 has the same genotype as the child – I0 I0 rr. It produces eggs of the same type – I0 r.

A man with Rh-positive blood of group AB has the genotype IA IB R_. The exact genotype for the Rh factor does not matter, because according to the blood group it produces spermatozoa IA and IB, which in a marriage with the woman described above will give offspring represented only by children with blood groups II (genotype IAI0) III (genotype IBI0), which will exclude his paternity.

Thus, the child belongs to the second parental couple, whose genotypes are not indicated in the statement of this problem.

Answer: the child belongs to the second parental pair.



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