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The mother isn't really A, that what makes it confusing.
is no dominance.
is either AA or AO.
her husband is AB The man is BB or BO.
child thats O is really OO.
is no dominance.
is either AA or AO.
her husband is AB The man is BB or BO.
child thats O is really OO.
Mon, 06 Feb 2012 07:55:14 GMT
The woman, with blood type A, married a man who has blood type B.
has a child, one of type O and the other type A.
the above, we can already deduce that the woman has the genotype AO. In short, both A and B are dominant to O, and both A and B can co-dominate (as in type AB blood). To be type O, one must inherit TWO recessive alleles, one from each parent.
Punnett's square will give you a clearer picture: BO (man) x AO (woman) A O B AB BO O AO OO You get a 25% (1/4) chance that the child would be type O (OO), 25% (1/4) chance that the child would be type A (AO), 25% (1/4) chance that the child would be type AB, and 25% (1/4) chance that the child would be type B (BO). To prove that the woman is type AO, we can reason it with the following: Her father has type AB blood while her mother is a type A.
the father is type AB, he cannot have an allele for type O.
the recessive allele must've come from the woman's mother, as shown in the Punnett's below. A O A AA AO B AB BO
has a child, one of type O and the other type A.
the above, we can already deduce that the woman has the genotype AO. In short, both A and B are dominant to O, and both A and B can co-dominate (as in type AB blood). To be type O, one must inherit TWO recessive alleles, one from each parent.
Punnett's square will give you a clearer picture: BO (man) x AO (woman) A O B AB BO O AO OO You get a 25% (1/4) chance that the child would be type O (OO), 25% (1/4) chance that the child would be type A (AO), 25% (1/4) chance that the child would be type AB, and 25% (1/4) chance that the child would be type B (BO). To prove that the woman is type AO, we can reason it with the following: Her father has type AB blood while her mother is a type A.
the father is type AB, he cannot have an allele for type O.
the recessive allele must've come from the woman's mother, as shown in the Punnett's below. A O A AA AO B AB BO
Mon, 06 Feb 2012 08:20:22 GMT