Mendel and Morgan Did Not Know About the Structure of DNA;

Multiple Choice

Mendel and Morgan did not know about the structure of DNA; however, which of the following of their contributions was (were) necessary to Watson and Crick?

A) the particulate nature of the hereditary material
B) dominance vs. recessiveness
C) sex-linkage
D) genetic distance and mapping
E) the usefulness of peas and Drosophila