King George III of England and Other Members of the Royal

question 52

Multiple Choice

King George III of England and other members of the royal family were afflicted with a series of strange, seemingly unrelated symptoms including abdominal pain, rapid pulse, convulsions, and insanity. It has been determined that he likely suffered from porphyria, caused by a mutation in a single allele. What is the genetic term describing the alteration of multiple, distinct traits of an organism by a mutation in a single gene?

• A) incomplete dominance
• B) pleiotropy
• C) epistasis
• D) codominance
• E) incomplete penetrance

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Definitions:

Cesarean Delivery

An operation where a baby is delivered by making incisions in the abdominal and uterine walls of the mother.

Sudden Infant Death Syndrome

A mysterious and tragic condition whereby an apparently healthy infant dies unexpectedly, typically during sleep, and without a clear cause.

Crib Death

Also known as Sudden Infant Death Syndrome (SIDS), it is the unexplained death of a healthy infant, usually during sleep.

Receptors of Light

Specialized cells in the eyes, such as rods and cones, that respond to light and enable vision.