Multiple choice

The augmenting frequency of yellow-brown hair among Australian aborigines as one moves inland from the southwest coast of Australia is an example of

  1. random variation

  2. progressive gradation

  3. discontinuous distribution

  4. natural selection

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The gradual, more or less continuous change in hair colour from one group of aborigines to another is not random or haphazard. There probably is a progressive gradation because there are different evolutionary pressures from one region to another.