Question

The novelty and brilliant insight of Darwin was that he asserted that variations, which are ______W_______and which make resource utilisation better for few will enable only those to reproduce and leave______X_______. Hence over a period of time there would be ______Y_______in population characteristic and hence______Z_______appear.
In the above paragraph, W, X, Y, and Z respectively are:

• A. Heritable, less progeny, a change, no new forms
• B. Non-heritable, more progeny, a change, new forms
• C. Heritable, more progeny, a change, new forms
• D. Heritable, less progeny, no change, no new forms

Answer 1

Answer: (C)

The novelty and brilliant insight of Darwin was that he asserted that variations, which are heritable and which make resource utilization better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny. Hence for a period of time, over many generations, survivors will leave more progeny and there would be a change in population characteristic and hence new forms appear to arise.