if a mother blood group is A+ and father group B+ then how become baby blood group O+ or A- or B-
50% chance A or b but 50% b positive
There is 25% of O+ also there is chance of negative by same ratio
Y A+ or B+ has 50% occurrence, O has 25% chance, I.e if not A or B. Diz can only takes place from d 2nd child due to alteration to n exchange of substance between mother n d 1st conception.
Whats the proses to made group in mother uterus