Darwin was able to formulate his theory of evolution based on several facts. Which of the following facts was unavailable to Darwin in the mid-nineteenth century?

Question

Natural resources are limited.

Individual organisms in a population are not alike.

Characteristics are inherited as genes on chromosomes.

Most populations are stable in size.

All populations have the potential to increase.

I was thinking that it was "Characteristics are inherited as genes on chromosomes."

Answer 1

I agree.

http://www.biologie.uni-hamburg.de/b-online/e11/11.htm

Answer 2

Thank you!