Question

Humans may have Rh blood or Rh- blood. A person who is Rh (R) has a certain type of protein on the red blood cells. A person who is Rh- (r) does not have this particular protein. In humans, Rh dominates Rh-. Normal insulin (I) production dominates abnormal insulin production (i) (diabetes). If both parents are heterozygous for both Rh and normal insulin production, what phenotypes would they produce in their offspring

Answer 1

Answer:

- Rh, normal insulin

- Rh, no insulin

- Rh-, normal insulin

- Rh-, no insulin.

Explanation:

This question involves two genes; one coding for Rhesus factor and insulin product. The allele for Rh blood and normal insulin dominates that of Rh- and no insulin.

According to this question, if both parents are heterozygous for both Rh and normal insulin production and cross, i.e. RrIi × RrIi, the following phenotype of offsprings will be produced (see punnet square):

- Rh, normal insulin (R_I_)

- Rh, no insulin (R_ii)

- Rh-, normal insulin (rrI_)

- Rh-, no insulin (rrii)