Is it type blood O? help me it's about biology ?

Question

A man, is accussed of fathering two children, one with type O blood and another with type A blood. The mother of the child ren has type B blood. The man has AB blood. Could he be the father of both children? Explain your answer.

Answer 1

In blood, type A nd type B blood group are dominant over blood group O but type A nd type B in themselves are codominant. Hence, the 4th blood group AB. If the father has blood group AB, that means he has genes of both blood type A nd blood type B. The mother has blood group B, that means her genes could either be BB or BO because O is recessive so, only B blood group would be expressed.

The children have equal chances of having any of gene type of father or mother. So, blood group A in child is possible as father's O gene could have grouped with mother's O blood group. But it is not possible for the second child to have blood group O.

So, he is the father of only 1 child i. e. the child with blood group A

Answer 2

No, because there is no possibly that type O blood could result from parents of type B and type AB.

Answer 3

Because the man must contribute either an A or a B to his offspring, he cannot have fathered an O blood type, which contains neither A nor B. If the mother's genotype is BO, it is possible that the A type is his: A from father, O from mother. We would need to know more about the mother's ancestors to determine if she were BB or BO.  

Answer 4

No - he could not father the type O child.  The 'o' gene is recessive, and therefore the child with type O blood is homozygous (oo).  The father cannot pass on the o gene.

The AB man can only be the father of the type A child if the mother is a heterozygous type B (Bo).  The child could get A from dad and o from mom, resulting in the Ao allele (which is a heterozygous type A since the A gene is dominant over the o).

Answer 5

Yes to the child with A no to the child with O

There are four basic blood types, in order of frequency from most common to rarest they are: O, A, B, and AB. Blood type is determined by the "alleles" that we inherit from our parents. Alleles are possible types of a particular gene, in this case the blood type gene. There are three basic blood type alleles: A, B, and O. We all have two alleles, one inherited from each parent. The possible combinations of the three alleles are:

OO

AO

BO

AB

AA

BB

See link below for all possible & impossible combination options

Answer 6

Yes to one, no to the other.

He is AB, this means he can father A children, B children, or AB children, regardless of the mother.