a mother has blood type A Rh+ which is heterozygous for ABO A mother has a blood

Question

a mother has blood type A Rh+ which is heterozygous for ABO A mother has a blood type A Rh^which is heterozygous for ABO blood group and homozygous dominant for Rh blood group. The father's blood type is O Rh^+ which is homozygous for ABO blood group and heterozygous for Rh blood group. Remember, that (A) allele codes for A antigens and the (O) allele codes for neither A nor B antigen. The dominant allele (+) c codes for the RhD antigen and the recessive allele (-) does not code for the RhD antigen. Genotypes AA, BB, OO, (++) and (--) are homozygous. Genotypes AB, BO, AO and (+-) are heterozygous. Two dominant alleles (++) or one dominant allele and one recessive allele (+-) produce Rh^- blood and two recessive alleles (--) produce Rh^- blood. With this information answer the following questions by using the Punnett square below: What is the genotype of the mother? What is the genotype of the father? What is the phenotype of the mother? What is the phenotype of the father? What are the chances (%) that they will have a child with type O Rh^+ blood? Give the % of each genotype. What are the chances(%) that they will have a child with type A Rh^- blood? Give the % of each genotype.

Explanation / Answer

Mother's genotype can be written as iAiO(+-) Rh(++)

Father's genotype can be written as iOiO(--) Rh(+-)

Phenotype of mother is written as Group A Rh factor+

Phenotype of Father is written as Group O Rh factor+

The alleles formed by the Mother - iA+ , iO+

The alleles formed by the Father-iO+, iO -

Looking at the punnett square:

The chances of the Child having O Rh+ is 50%.

Out of which genotypically, 25% will be iOiO - +   and 25% will be iOiO + +

The chances of a child having the blood group A Rh- is 0%.

i A + iO + iO- iAiO + - iOiO - + iO+ iAiO + + iOiO + +

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