HEREDITY
MULTIPLE ALLELES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the offspring of a cross have the blood groups O and A the genotypes of parents could be
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IAIA and IAIO
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IA IO and IA IO
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IAIA and IAIA
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IAIA and IoIo
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Explanation:
Detailed explanation-1: -Someone with blood type O has neither the A nor the B allele. The genotype must be OO.
Detailed explanation-2: -If one parent has A and another has O, they can either produce a child with A or O blood types.
Detailed explanation-3: -Remember, because type O blood results from the homozygous recessive genotype (i i ), the only way to produce a type O child is if both parents provide an O allele (i ).
Detailed explanation-4: -This has implication when having children because, if both parents carry the IO allele, a child could be born with the genotype IOIO (blood group O), even though neither of the parents have this phonotype.
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