Questions: Based on his experiments with pea plants, how many factors did Mendel conclude an offspring receives for a single characteristic? A. 1 B. 3 C. 0 D. 2

The answer is D: 2.

Explanation for each option:

A. 1 - This is incorrect. Mendel's experiments showed that each offspring receives two factors (now known as alleles) for each characteristic, one from each parent.

B. 3 - This is incorrect. Mendel concluded that there are two factors for each characteristic, not three.

C. 0 - This is incorrect. Mendel's work demonstrated that offspring do receive factors for characteristics, specifically two.

D. 2 - This is correct. Mendel concluded that each offspring receives two factors for a single characteristic, one from each parent. These factors are now understood as alleles, which are different forms of a gene.

Summary: Mendel's experiments with pea plants led him to conclude that offspring receive two factors for each characteristic, one from each parent.