In genetics, what do we call traits that can be attributed to a single gene?

• A. Polygenic traits
• B. Qualitative traits
• C. Quantitative traits
• D. Complex traits

Answer: (B)

Traits that can be attributed to a single gene are referred to as qualitative traits. These traits often exhibit distinct phenotypes and are typically categorized in a binary fashion, such as flower color, seed shape, or the presence of a particular characteristic. This straightforward inheritance pattern can often be observed in Mendelian genetics, where one gene directly influences one trait.

In contrast, polygenic traits are influenced by multiple genes, leading to a continuous range of phenotypes, such as height or skin color. Quantitative traits also refer to characteristics that can be measured along a spectrum, often influenced by multiple genetic and environmental factors. Complex traits involve interactions between multiple genes and environmental influences, making their inheritance patterns multifaceted. Thus, qualitative traits are the clearest representation of single-gene influence in genetics.