heredity & evolution??

Asked by  | 18th Oct, 2008, 05:41: AM

Expert Answer:

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.

When a heterozygous AO male mates with OO female, the offspring could be either AO (i.e. with A blood group) or OO( i.e. with O blood group). Ideally if blood group A is present along with O, it is the dominating group, i,e, the person will show A blood group. But if we follow that principle in the above question, the child should be having A blood group and not O. So here the father has heterozygous blood group AO and the offspring gets the OO gene, resulting in O blood group. This does not mean that O is dominant over A group. It just means that recessive O gene is present in homozygous pattern.

Answered by  | 18th Oct, 2008, 06:32: AM

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