A man of Blood Group A marries a woman of blood group O.their daughter has blood group O.
Asked by | 4th Feb, 2009, 12:59: PM
The remaining part of the question is: Based on this information, can we deduce the dominant blood group? Why or why not?
No it is not enough.
This information is insufficient to determine the dominant blood group. During cross breeding, even recessive traits can express themselves phenotypically. For example, if a heterozygous male AO mates with OO female, then there is a probability of the child inheriting OO genotype. So, you cannot determine the dominant blood group in this case.
The ABO blood type is controlled by a single gene with three alleles: i, IA, and IB. The IA allele gives type A, IB gives type B, and i gives type O. As both IA and IB are dominant over i, only ii people have type O blood. Individuals with IAIA or IAi have type A blood, and individuals with IBIB or IBi have type B. A type A and a type B couple can also have a type O child if they are both heterozygous (IBi,IAi).
So in case of a heterozygous male with IAi genotype marrying a ii genotype female, the child has a probability of inheriting ii phenotype, which results in O blood group. The A blood group is actually dominant over O, but here we cannot determine the dominancy based on the given example.
Answered by | 4th Feb, 2009, 08:02: PM
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