Question

In: Biology

Why does this test NOT prove that a given person is Andrea's father?

 

Andrea has AB+ blood type

Candidate 1: A-

Candidate 2: B-

Candidate 3: AB+

June which is her mom has B- blood type.

Why does this test NOT prove that a given person is Andrea's father?

and what additional test can be done to show that a candidate is indeed Andrea's father?

Condidate3: AB+

Solutions

Expert Solution

ABO blood group is a multiple allele phenomenon , in which A and B are codominant , O is recessive to both A and B allele. Rh positive is dominant to Rh negative. June is B-, it means she has either two B alleles or one B allele and one O allele . But she should be heterozygous Rh-. Andrea has AB+ genotype. It means she has received one B alleles from her mother and one A allele from her father. But her mother is Rh- allele so Andrea will be Rh+ only when she will receive Rh+ allele from her father.

Candidate A and Candidate B both have only Rh- allele (homozygous Rh-), so they cannot be Andrea's father.

AB+ candidate may be her father if he is homozygous Rh+. So additional test has to e performed to determine Candidate 3 is homozygous Rh+ or heterozygous Rh+. If he is homozygous Rh+, he may be Andrea's father. But if he is heterozygous Rh+, then he must give Rh+ allele to Andrea. So there. is 50 % chance


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