Ms. Pratt is claiming that Mr. X is the father of her child. Ms. Pratt is O-. Her baby boy is A+. Mr. X is blood type B+. Could he be the father of her child? If not, what blood type would he be expected to be?

Question

Ms. Pratt is claiming that Mr. X is the father of her child. Ms. Pratt is O-. Her baby boy is A+. Mr. X is blood type B+. Could he be the father of her child? If not, what blood type would he be expected to be?

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Md Ariful Islam · Answer 1 · Apr 02, 2024 09:48:30

There are 4 main blood types (8 if you include the Rhesus-factor)
It is a question of antigens and antibodies:

Bloodtype A has A-type antigens on the erythrocytes, and anti-B-type antibodies in the serum;

Bloodtype B has B-type antigens on the erythrocytes, and anti-A-type antibodies in the serum;

Blood type O erythrocytes don't carry antigens but the plasma has both anti-A and anti-B antibodies.

For the effects of pregnancy, the combinations and results are as follows:

$O and O rarr O$
$O and A rarr O or A$
$color(red)"O and B " rarr color(red)" O or B"$
$O and AB rarr A or B$
$A and A rarr O or A$
$A and B rarr O or A or B or AB$
$A and AB rarr A or B or AB$
$B and B rarr O or B$
$B and AB rarr B or A or AB$
$AB and AB rarr A or B or AB$

Therefore, if the baby is bloodtype A, the father can't possibly be mr. X....

The Rhesus factor is a bit more complicated, as it actually involves around 50 different factors, but suffice to say that, if one of the parents is $Rh^+$(positive), the child will be, no matter whether the other parent is $Rh^+$ or $Rh^-$...

Therefore, if mr. X would be that father, the child would have either $O^+$ or $B^+$...

Ms. Pratt is claiming that Mr. X is the father of her child. Ms. Pratt is O-. Her baby boy is A+. Mr. X is blood type B+. Could he be the father of her child? If not, what blood type would he be expected to be?

1 Answers