16. Which of the following observations or assumptions was NOT part of Darwin’s theory of natural selection?

        a. Traits are inherited as discrete units called genes.

        b. Evolution occurs over long periods of time.

        c. Populations produce more offspring than their environment can support.

        d. Organisms compete for limited resources.

Darwin recognized, and grappled with, the problem that his theory of natural selection depended upon the heritability of traits.   However, the principles of genetics were not understood during Darwin's life.  

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00