If both mom and dad are type b blood and the girl have type o and the mans mom is type o why?

Question

help

Answer 1

That is easy. Each of the B parents are expressing one of two genes, the other of which is O. Simple Mendelian grid. The man's mom is type O which means that she is OO, and she passed one to her son. Nothing fishy going on here.

Answer 2

From Arizona University:

"Each biological parent donates one of their two ABO alleles to their child. A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father). "

Check out the site -- there are simple explanations and a Blood Type Calculator. Fun stuff!!

Answer 3

type o is recessive so I believe both parents must have the o gene, though if they have an o and a b then the b will manifest itself in the parents, the daughter had to receive both o genes from the parents

Answer 4

Both parents are type "Bo". "o" is a recessive gene (one that doesn't show unless you have two identical ones). "B" is a dominant gene (you only need one for it to show). If Both parents are type "B" and the kid has type "o", that means the parents have type "Bo" instead of "BB" ("pure" type "B" blood).

Answer 5

If you use the Mandealing Grid, this makes sense.
Both parents have B, and the grandma has O, than it gets passed on to the daughter of the offspring of the grandma. Because her gene is more specific.

Answer 6

it is to be noted that blood group is determined by the the type of antigen and antibodies present in the body, and it is niot depended on parents,hence you dont have to think that same blood flows both through you and your parents.

Answer 7

And the girls paternal grandfather must have had the B allele.