IF father is A+ and mother is A-, next what are the possible blood group of the child for these parents?
Answers: Unfortunately Ruth does not know what she is talking almost.
As far as the ABO system goes the parents could enjoy a genotype of AA or AO (they could have one gene for the A blood group antigen or two, we adjectives have two sets of genes for everything, O technique no antigen). Thus the possible combinations are:
Both parents AA (25%). The children would all be A group.
Both parents AO (25%). The children could be AA (25%), AO (50%) or OO (25%). Therefore near this combination the probability of the child having blood group A is 75% while nearby is a 25% chance of have blood group O.
One parent AO and the other AA (50%). The chances are 50% that the child would be AA and 50% that it would be AO. In any case the blood group would be A.
Thus the overall probability of have a child with blood group O would be 25% of 25% which is 6.25%.
As far as the Rh system is concerned, the mother is -/- (she does not hold the gene for the Rh antigen. The father could be either +/+ or +/-.
The child would never carry the gene for the Rh antigen from the mother. The chances of getting the gene from the father are at lowest 50%. So the children have at smallest a 50% chance of man Rh +ve.
So in simple jargon the probabilities for the various possible blood groups would be:
A+ve 46.8%, A-ve 46.8%, O+ve 3.1% and O-ve 3.1%.
Sorry for the long winded explanation but I thought I have to explain my figures to convince you.
My parent's have 4 children. My Dad was AB+ and my Mom A- three of us children are A+ and 1 is A-
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