Question

Could Dolphia (O-) have a child with blood type AB+? Why or why not?

   Josie slept with 4 men near the time she conceived her son, Jeffrey. If Josie is A- and Jeffrey is O+, which of the following men could be Jeffrey’s father? Explain why or why not for each one.      Teddy AB+          Jeremiah O-        Paul B- Kris A+

Could Tom who is O- father a child who is A+? Why or why not? List all possible genotypes for Tom. List all possible genotypes for A+. If it is possible what blood types could the mother be?

Joe has blood type O-. He likes being a universal donor and wants to have a child with the same blood type. What genotypes and phenotypes does he need to look for in a mating partner?

Answer 1

Human ABO blood grouping have some unique properties. It shows multiple allelism and codominance. It have 3 alleles- A, B , O. A and B show codominance. Both A and B are dominant over recessive O. Six genotypes and four phenotypes are present,

The genotypes - AA, AO, BO, BB, AB, OO

Phenotypes - Type A, Type B, Type AB, Type O

If Rh antigen is present , then it is positive and if Rh antigen is absent then it is negative.

1.

Dolphia is O -   

Genotype is OO, Phenotype is O type blood, Rh antigen is absent

Child is AB +

Genotype is AB, Phenotype is AB type, Rh antigen is present.

Dolphia cannot have a child with AB+ blood group, because she doesnot have A or B alleles to give.

2.

Josie is A -

Phenotype is A type, Rh antigen is absent

Son Jeffrey is O +

Genotype is OO , Phenotype is O type , Rh antigen is present.

Since son Jeffrey is Rh positive and mom Josie is Rh negative, his father should be Rh positive. So paul (B-) and Jeremiah (O -) cannot be Jeffrey's father.

Teddy (AB+) cannot be jeffrey's father since Teddy have no O alleles.

Kris (A+) is Jeffrey's Father.

3.

Tom O -

Genotype OO , Phenotype O type, Rh antigen absent

Child A +

Genotypes AA or AO , phenotype A type, Rh antigen present.

Blood types for mother - A + or AB +

4.

Joe O -

Genotype OO , Phenotype O type, Rh antigen absent.

Child with same blood group of joe , O-

Genotypes of mating partner - OO , AO , BO

Phenotypes of mating partner - O- , A-, B -