Which of the following are true?

I. A single gene can control a single trait.
II. A single gene can influence multiple traits.
III. A single trait can be controlled by multiple genes.
A.
I and III only
B.
I, II, and III
C.
I and II only
D.
II and III only

A. I and III only

Explanation:
- A single gene can control a single trait (True - I)
- A single gene can influence multiple traits (False)
- A single trait can be controlled by multiple genes (True - III)