Multiple choice

Which of the following facts signifies the variation of population model of human?

  1. Each continent of the world is the home of a distinct race only.

  2. Mongoloids, Negroids, and Caucasoids are divergent species of people of today's world.

  3. If geographic and cultural obstructions to mating break down previously isolated populations will cease having distinct sets of physical traits setting them apart.

  4. Biologically distinct groups of individuals are those which had been gone through short breeding isolation.
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C Correct answer
Explanation

The populational model assumes that the only biologically distinct groups of people are those that have long breeding isolation. When the isolation breaks down, the genetic distinctness of such groups also ceases.

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