Question

Evaluate these Paternity Results.

	Mother	Alleged Father	Child
Phenotype	Jk(a+b-)	Jk(a-b+)	Jk(a+b-)
Genotype	Jka/Jka	Jkb/Jkb	Jka/Jka

1. Is the alleged father excluded?
2. What genetic marker should have the alleged father transmitted to the child?

Answer 1

A-Yes ,the alleged father is excluded, child does not express an antigen that he should have expressed based on the father’s presumed genotype,which means he not the potential father.

From the above,

Mother Phenotype : Jk(a+b-) Father Phenotype : Jk(a-b+) Possible progeny   : Jk(a+b+),Jk(a-b-) Phenotypes are

But the given child phenotype as Jk(a+b-) so we can exclude alleged father

B-since the possible genotype of child are Jka/Jkb,as the given child lacks Jkb allele, the alleged father should have transmitted Jkb genetic marker to the child.