Genetics problem?

Question

Genetics problem?
I'm usually opposed to ppl who post their homework on here, but I'm stuck on this problem:

A father of a certain family belongs to blood group AB, and the mother belongs to blood group O. They have four children, one belonging AB, one to group A, one to group B, and one to O. One of these children is adopted and another child is from an earlier marriage of the mother. State whih is the adopted child and which is the child from an earlier marriage.

no offense karen, but thats possibly the stupidest answer ive ever gotten.

Answer 1

Try this website: http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/inherited.html

My guess is that the AB and O children are either adopted or from an earlier marriage...can't tell which without more work.

Answer 2

I would assume that the ones that belong to the A group and the B group are both adopted, since the other children have AB and O, they are the real children. Hope this helps.

Answer 3

You do not say if that is intercourse-associated, so we''ll anticipate that is useful Mendelian genetics, then it might be D for dominant, additional digits. And d for the constant # of digits. Dad would be Dd or DD. Mom is dd. Children would be Dd : dd, two/four additional, two/four typical, for the primary pass. Children might be all Dd, four/four additional for the 2d pass. But the daughter is typical, dd. So, Dad is Dd. So that is the primary one, Dd:Dd, in which there's a 50/50 threat.