need help on blood types?

Question

If a child has type O blood and its mother has type A blood, could a man with type B blood be the father ? Why couldn't a blood test be used to prove that he is the father ?

Answer 1

Yes a man with blood type B could be the father.

In the event that mother has AO genotype (phenotype being blood group A) and father has BO genotype (phenotype being blood group B) then the punnet square cross would go:

___A___O
B_AB__BO
O_AO__OO

ie they have 25% chance of having an AB child, 25% chance of having a BO child, 25% chance of AO and 25% chance of OO

OO genotype has a blood group O phenotype

Hence an ABO blood test could not be used to prove/disprove paternity.

Answer 2

This is a problem of Mendelian genetics. This would depend on the fathers genotype. Generally I would say yes because he could carry the recessive o allele and not show the blood type because B (and A) are dominant to o. A blood test would not determine if he is the parent because they usually do not run a DNA test. You would need a DNA test to determine the fathers exact genotype (whether he has 2 B alleles BB or a B and an O Bo).

Answer 3

Each biological parent donates one of their two ABO alleles to their child. A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).

The Biology Project Blood Type Calculator
Child Blood Type Parent Blood Type
Child-O Mother-A
Possible Type of Other Parent
A, B, O


Yes it is possible for the father to be B. You need a DNA test to prove it positively.



To learn more go to this site:

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

Answer 4

A terminal sugar makes the difference between blood types

There are 8 sugars for cellular communication.

In England they do sugar printing in blood samples and can see arthritis disease up to 15 years before the symptoms are experienced by the individual.

This sugar printing identifies which terminal sugar is missing in the blood and as the symptoms progress, the disease is worse.

See http://www.glycoscience.org and read "Introduction to Glyconutrients" and "Disease Specific Reviews" and you will see a definitive medical text revealing blood types and their differences are merely terminal sugars of the 8 for cellular communication.

All of this is very cutting edge information.

Answer 5

haven't had bio for a while BUT i believe he could be the father...

AO + BO = OO