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LoginQuestion : 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 ?
Class 10 Biology in Class 10 3 years ago
Woman with blood group O, so genotype will be ii.
Daughter.s blood group is O, so blood group will be i i.
This cross clearly shows that the daughter MUST get two genes from two PARENTS. Since mother has both RECESSIVE genes, she can give only recessive gene. This implies that father must have genotype `I^(A)` i (for blood group A) so as to be able to give other .i. to the daughter Since blood group O is expressed only in homozygous recessive situation ie., .i i hence it is recessive trait.
Blood group .A. is a DOMINANT trait as it expressed even in heterozygous condition.
Thus this information is enough.
Posted on 04 Dec 2021, this text provides information on Class 10 related to Biology in Class 10. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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