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A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents
  • a)
    I
    AIA and iBi
  • b)
    IAi and IBi
  • c)
    IAi and ii
  • d)
    ii and IBIB
Correct answer is option 'B'. Can you explain this answer?
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A child has blood group O. If the father has blood group A and mother ...
If father has blood group 'A', mother has blood group 'B', and the child with blood group 'O' appears in progeny, this means that the parents are heterozygous.
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A child has blood group O. If the father has blood group A and mother ...
Genotypes of the Parents

The blood group of an individual is determined by the presence or absence of specific antigens on the surface of their red blood cells. There are four main blood types: A, B, AB, and O. The A and B blood types are codominant, meaning that both antigens can be present and expressed together in an individual who has the genotype for both. However, if an individual has the O blood type, it means that they do not have either A or B antigens on their red blood cells.

Given that the child has blood type O and the father has blood type A, and the mother has blood type B, we can deduce the genotypes of the parents.

In this case, the child has the O blood type, which means that the child's genotype is ii. The child inherited one 'i' allele from each parent since the O blood type is recessive to both the A and B blood types.

For the father to have blood type A, he must have at least one 'A' allele. Therefore, his genotype can be IAIA or IAi.

For the mother to have blood type B, she must have at least one 'B' allele. Therefore, her genotype can be IBIB or IBi.

From the given options, the only genotype combination that can result in a child with blood type O is when the father has genotype IAi and the mother has genotype IBi. In this case, both parents have one 'i' allele, which is necessary for the child to have blood type O. The child inherits one 'i' allele from each parent, resulting in a genotype of ii.

Therefore, the correct answer is option B: IAi and IBi.
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A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parentsa)IAIA and iBib)IAi and IBic)IAi and iid)ii and IBIBCorrect answer is option 'B'. Can you explain this answer?
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