The Study of Sickle-Cell Anemia and Its Relation to Malarial

question 6

Multiple Choice

The study of sickle-cell anemia and its relation to malarial environments demonstrates that

• A) homozygotes lack the capacity to digest lactose.
• B) changes in cultural adaptation can result in changes in the selective pressures on a human population.
• C) selection removes recessive alleles from the gene pool faster than it does dominant alleles.
• D) heterozygotes are not as selectively fit as are dominant homozygotes.
• E) natural selection improves a gene pool by wiping out deleterious alleles.

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Definitions:

Retroperitoneal

Located behind the peritoneum, the membrane lining the abdominal cavity and covering the abdominal organs.

Mesenteries

Folds of peritoneum that attach the intestines to the abdominal wall, supporting and allowing vascular and neural communication.

Mastication

The action of masticating food to ready it for swallowing and subsequent digestion.

Parasympathetic Nerves

A division of the autonomic nervous system responsible for rest and digest functions, conserving energy and lowering metabolism.