In Humans Skin Color Widely Varies

question 71

Multiple Choice

In humans skin color widely varies.This is because skin color is

• A) a polygenic trait.
• B) influenced by environmental changes like improvements in diet.
• C) influenced by an X-linked gene.
• D) influenced by a Y-linked gene.
• E) influenced by crossing over.

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Definitions:

Fault Zone

A fault zone is a region of the Earth's crust characterized by one or more faults, which are fractures along which there has been displacement of the sides relative to one another.

Unconformity

A surface within the rock record that represents a gap in the geological history due to erosion or non-deposition of sediments.

Petroleum

A naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons, used primarily as fuel and in chemical production.

Oil Shale

A fine-grained sedimentary rock from which liquid hydrocarbons (shale oil) can be produced, serving as a potential source of unconventional oil.