Question

frederick griffith made a scientific discovery in 1928. which best describes the knowledge about genetics before 1928?
a. scientists thought that only viruses contained dna
b. scientists did not think that traits were inherited
c. scientists thought that traits were passed along by dna
d. scientists did not know how traits were inherited

Explanation:

Before Griffith's 1928 transformation experiment, scientists knew traits were inherited (disproving B), but had not established that DNA was the hereditary material (disproving C). They also knew DNA existed in non-viral cells (disproving A). The key gap was understanding the mechanism of trait inheritance.

Answer:

D. Scientists did not know how traits were inherited