Which type of genetic trait is influenced by multiple genes?

Which type of genetic trait is influenced by multiple genes?

• A. Qualitative traits
• B. Quantitative traits
• C. Dominant traits
• D. Recessive traits

Answer: (B)

The correct choice is indeed quantitative traits. These traits are influenced by the combined effects of multiple genes, often referred to as polygenic inheritance. This means that rather than being determined by a single gene, quantitative traits result from the additive effects of several genes, each contributing to a small part of the overall phenotype. This polygenic nature often leads to a continuous range of phenotypes, such as height, weight, and skin color, rather than distinct categories.

In contrast, qualitative traits are typically controlled by one or a few genes and tend to produce discrete phenotypic categories, such as flower color (red or white) or the presence of a particular trait (like the appearance of a trait in either dominant or recessive forms). Dominant and recessive traits refer to the expression of specific alleles rather than the influence of multiple genes, thus not fitting the criteria of being influenced by multiple genetic factors.