Question

What is true about the heterozygous sickle-cell (HbA HbS) condition?


Options:

sickle-cell anemia is not expressed

sickle-cell anemia is expressed under conditions of oxygen deficiency

sickle-cell anemia is apparent in men

none of the above

Answer 1

Answer:

sickle-cell anemia is not expressed

Explanation:

The heterozygote conditions shows that, the manifestation of theses condition is only possible if the carrier man(HbSHbA) get married to another heterozygote woman,( another carrier) so that the two recessive alleles are expressed as SS.

But as AS, this is not possible because of the non defective A-allele which is always  dominant over the S

Answer 2

Answer:

sickle-cell anemia is expressed under conditions of oxygen deficiency

Explanation:

This is the correct answer because when someone has an HbA HbS condition, you might not see the effects of the condition until they are oxygen-deprived. Then, the symptoms occur.