The Thumb and Big Toe Are Similar in That

question 50

Multiple Choice

The thumb and big toe are similar in that

• A) both contain carpal bones.
• B) each have three metatarsals.
• C) both are composed of sesamoid bones.
• D) both have two rather than three phalanges.
• E) both have three rather than two phalanges.

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Definitions:

Polygenetic Inheritance

Two or more genes contributing to the phenotypic expression of a single characteristic.

Genotypic Expression

The manifestation of characteristics or traits in an organism resulting from the interaction of its genetic makeup with the environment.

Phenotypic Expression

The observable physical or physiological traits of an organism, which result from the interaction of its genotype with the environment.

Genetic Drift

A mechanism of evolution that involves random changes in the frequency of alleles within a population over time, not necessarily driven by natural selection.