Question

plz answr this question properly
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?​

Answer 1

Answer:NO

Explanation:To check if the trait is dominant or recessive, we already need four children ...

Answer 2

Answer:

A man is having blood group A. Hence, he must be having genotype I

A

I

A

or I

A

I

O

. He will produce two types of gametes I

A

and I

O

. A woman is having blood group O. Hence, she is having genotype I

O

I

O

. She will produce one type of gamete I

O

. Their daughter will get I

O

allele from mother and I

O

allele from father. Hence, she is having blood group O.

Thus, the given information is enough to tell that blood group A is dominant over blood group O as two alleles of I

O

are required to have blood group O and only one allele of I

A

is enough to have blood group A.