Question

In blood types, the alleles for A (IA) and B (IB) antigens are codominant to the recessive allele (i) for no antigens. Also, the allele for the presence of the Rh factor antigen (Rh + ) is dominant over the allele for the absence of Rh factor antigen (Rh - ). If a A+ parent, heterozygous both traits , is crossed with B + parent, also heterozygous for both traits, what are the resulting F1 phenotypes?

Answer 1

Dd – heterozygous for rhesus factor

A0Dd x B0Dd

F1: AB Rh+ 3/16

AB Rh- 1/16

AO Rh+ 3/16

AO Rh- 1/16

BO Rh+ 3/16

BO Rh- 1/16

OO Rh+ 3/16

OO Rh- 1/16