Answer and explanation

Correct answer: D. Differential survival and reproduction of individuals with favourable traits

  1. Step 1: Natural selection acts on heritable variation. Answer: Differential survival and reproduction of individuals with favourable traits. Why not the others: Random change in allele frequency only, Deliberate breeding and Acquired traits passed on don't fit.

Practise more Microbiology, ecology and evolution.

Free questions with an explanation for every one, and full timed Medical Entrance Exam (University of Iceland) mock tests.