A cline is a gradual change in a trait over a geographical gradient, which represents a continuous variation that follows a continuum. The variation of skin color in relation to latitude is an example of a cline. Therefore, option D is correct. Option A is also correct, as it describes the same concept as option D.

Solved

A Cline

Question 7

Multiple Choice

A cline:

A) is continuous variation that follows a continuum.
B) is variation that falls into discrete categories.
C) describes the pattern of occurrence of trisomy 18.
D) describes the pattern of variation of skin color in relation to latitude.
E) both A and D

Correct Answer: