A couple with the following blood types: the man has type AB and the woman has type B, discover their child has type O blood. Is it possible that one of these ‘parents’ may not actually be the genetic parent of this child? If so, which one, and how do you know?
Use the information below to answer questions 3-6.
There may be a number of possible alleles for a given gene within a population. In a multiple allele system the dominance relationships between the various alleles must be considered. One of the more familiar examples of a multiple allelic system is that of human ABO blood types. The gene involved codes for a protein on the outside of red bloods cells. Three alleles (IA, IB and i) determine whether the protein is present or absent and the form of the protein present. The A and B alleles code for the A and B forms of the protein and are co-dominant to each other. The O allele (i) codes for no protein and is recessive to both A and B
A couple with the following blood types: the man has type AB and the woman has type B, discover their child has type O blood. Is it possible that one of these ‘parents’ may not actually be the genetic parent of this child? If so, which one, and how do you know?
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