Father is A +ve, Mother is O+ve, can the 1st child have O-ve blood group, Maternal grandmother is O-ve?

Answer 1

It depends on the father.If his allels are homogenous then the kids will be A and if his alleles are heterogenous then the kids will be A and O in a 50:50 ratio.All together the possibility of having a zero bloodtype, given the information is 25%.
As for the + - thing it can happen that the kid will be - if both parents carry the gene of the - within them which is possible in the mother and could also be possible in the father although there is no info on that given so that's counting 50% that he might carry the gene.Anyway if the father doesn't carry the gene then it's impossible, if he does then the possibility is 25%.There is 100% possibility of the mother carrying the - gene.Alltogether the possibility of - bloodtype given the information is 50%* 25%=12.5%.

Now give that to some people who likes math problems and let him calculate what the possibility of getting both quality in one child is.
The figures are 25% for 0 and 12.5% for-.
I'm bored.


Ps. the A and the + are dominant, that's what I based the calculations on.
More info on the family could give a more accurate answer.

Answer 2

I'm not sure what the ve represents. If it is equivalent to Rh, then yes . Each parent will have a gene from each of their parents. A is dominant over O so if the father had a parent with type O, and a parent with a -ve it could easily happen since the Mother obviously will have a neg. gene from her own mother.

Answer 3

Yes

Answer 4

it is likely and most probable that the child will have tyype O blood

Answer 5

yes, it's possible.