The traits that Mendel studied are most often influenced by single genes.

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This statement is true. Mendel studied traits that were controlled by single genes, which he called "unit factors." These included traits like pea color, pea texture, and flower position, which are determined by the presence or absence of a single gene. However, many traits are influenced by multiple genes and environmental factors, and are therefore more complex to study.

The Traits That Mendel Studied Are Most Often Influenced by Single