Frederick griffith made a scientific discovery in 1928. which best describes the knowledge about genetics before 1928?

a. scientists did not think that traits were inherited.
b. scientists thought that only viruses contained dna.
c. scientists thought that traits were passed along by dna.
d. scientists did not know how traits were inherited.

Scientists did not know how traits were inherited.

Explanation:

APEX

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.