a difficult one
Asked by csmadhav | 12th Oct, 2009, 11:04: PM
No it is not enough.
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 | 13th Oct, 2009, 11:45: AM
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