Question

Which is the dominant allele of Rh factor and what does this mean for people who are homozygous recessive?

A) The dominant allele is Rh-positive, and homozygous recessive individuals can donate blood to anyone.
B) The dominant allele is Rh-negative, and homozygous recessive individuals can only receive Rh-negative blood.
C) The dominant allele is Rh-positive, and homozygous recessive individuals can only receive Rh-negative blood.
D) The dominant allele is Rh-negative, and homozygous recessive individuals can donate blood to anyone.

Answer 1

The dominant allele of the Rh factor is Rh-positive. Homozygous recessive individuals can only receive Rh-negative blood.

Step-by-step explanation:

The dominant allele of the Rh factor is Rh-positive. This means that individuals who are homozygous recessive, meaning they have two recessive alleles, can only receive Rh-negative blood. Homozygous recessive individuals lack the Rh protein on their red blood cells, so if they receive Rh-positive blood, their immune system will produce antibodies against the Rh antigen, causing a potentially severe immune response.