A Genetic Change That Caused a Certain Hox Gene to Be

question 37

Multiple Choice

A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of the tetrapod limb. This type of change is illustrative of

• A) the influence of environment on development.
• B) paedomorphosis.
• C) a change in a developmental gene or its regulation that altered the spatial organization of body parts.
• D) heterochrony.
• E) gene duplication.

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Definitions:

Male Sex Workers

Men who engage in sexual activities in exchange for money or other forms of compensation.

Gigolo

A man who is paid for his companionship or sexual services by a woman.

Sexual Services

Activities provided by someone that are primarily aimed at inducing sexual arousal or satisfaction in exchange for compensation or favors.

Heterosexual-Oriented

A term describing individuals who are romantically or sexually attracted to people of the opposite sex.