Multiple choice

The increasing frequency of yellow-brown hair among Australian, primitives as one moves inland from the southwest coast of Australia is a prominent example of

  1. random variation

  2. progressive gradation

  3. discontinuous distribution

  4. continous variation
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 primitives to another is not random or haphazard. There probably is a progressive gradation because there are different evolutionary pressures from one region to another.

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