A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits - blood group A or O - is dominant? Why or why not?
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The information is not enough to decide which blood group is dominant.
But universally , blood group A is dominant whereas blood group O is recessive.
case 1: For an A group father it may be homozygous (AA) or heterozygous(A0) as pairs.So as A is dominant and an O group mother, the O group is recessive, then the daughter may have either group O Or A.
If A from father crosses with O of mother then blood group of daughter =A(dominant)
case 2:But if O from father crosses with O of mother then blood group of Daughter=) (as recessive) blood group expressed in homozygous condition.
But universally , blood group A is dominant whereas blood group O is recessive.
case 1: For an A group father it may be homozygous (AA) or heterozygous(A0) as pairs.So as A is dominant and an O group mother, the O group is recessive, then the daughter may have either group O Or A.
If A from father crosses with O of mother then blood group of daughter =A(dominant)
case 2:But if O from father crosses with O of mother then blood group of Daughter=) (as recessive) blood group expressed in homozygous condition.
Gauravdas:
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A man with blood group A marries a woman with blood group O and their daughter has blood group O. This information is enough to tell you that which of the traits - blood group A or O - is dominan.
The man (father) having blood group A can have 2 genes combinations of IA IA and IA IO. the woman (mother) having blood group O can have only genes combination IO IO. the daughter having blood group O will have only the gene combination IO IO. the daughter has inherited blood gene IO IO from man(father) and woman( mother) respectively. The genes IO and IO combined together to give blood group O. So daughter will have blood group O. The blood group O acquired by daughter gives information that IO is the recessive gene whereas IA is the dominant gene for the blood group. Recessive traits appear when both the parents contribute recessive genes
The man (father) having blood group A can have 2 genes combinations of IA IA and IA IO. the woman (mother) having blood group O can have only genes combination IO IO. the daughter having blood group O will have only the gene combination IO IO. the daughter has inherited blood gene IO IO from man(father) and woman( mother) respectively. The genes IO and IO combined together to give blood group O. So daughter will have blood group O. The blood group O acquired by daughter gives information that IO is the recessive gene whereas IA is the dominant gene for the blood group. Recessive traits appear when both the parents contribute recessive genes
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