With Respect to the Alleles for Sickle Cell Anemia, Which

question 57

Multiple Choice

With respect to the alleles for sickle cell anemia, which genotype(s) is (are) at a disadvantage to persons residing in tropical areas of Africa?

• A) heterozygous
• B) homozygous dominant
• C) homozygous recessive
• D) both heterozygous and homozygous dominant
• E) both homozygous dominant and homozygous recessive

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Definitions:

Epididymis

A long, coiled tube attached to the back of the testis that stores and carries sperm.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA).

Sperm

The male reproductive cells capable of fertilizing a female's egg to produce offspring.

Egg

The female reproductive cell or gamete in animals and plants; an ovum.