Though Sickle-Cell Anaemia Is Frequently Lethal for Individuals Who Are

question 11

Multiple Choice

Though sickle-cell anaemia is frequently lethal for individuals who are homozygous for the sickle-cell allele,natural selection seems to have maintained that allele in certain geographic locations.A likely explanation for this observation is that

• A) the forward mutation rate to sickle-cell is much higher in those regions.
• B) individuals with sickle-cell anaemia live longer and have more children.
• C) reversion from sickle-cell to wild-type is prevented in some populations.
• D) individuals who are heterozygous for the sickle-cell allele are protected from malaria.
• E) only certain populations have been tested for the presence of the sickle-cell allele.

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Definitions:

Vinegar

An acidic liquid produced from the fermentation of ethanol by acetic acid bacteria, used as a condiment and for preservation.

Acid Base

Refers to the balance between acids and bases in the body, crucial for maintaining physiological pH and metabolic functions.

Mitochondria

Organelles found in the cytoplasm of eukaryotic cells, responsible for producing energy through the process of cellular respiration.

Cellular Respiration

The metabolic process by which cells produce energy in the form of ATP from glucose and oxygen, and release carbon dioxide and water.