What type of trait is controlled by two or more genes?

What type of trait is controlled by two or more genes?

• A. Monogenic
• B. Polygenic
• C. Epigenetic
• D. Holistic

Answer: (B)

A trait that is controlled by two or more genes is classified as a polygenic trait. Polygenic traits are influenced by multiple genes, often located on different chromosomes, and each of these genes contributes to the overall phenotype of the organism. This type of inheritance typically results in a continuous range of phenotypes, demonstrating the complexity and variability seen in traits such as height, skin color, and intelligence in humans. In contrast, monogenic traits are controlled by a single gene, leading to distinct categories of phenotypes. Epigenetic traits involve changes in gene expression that do not alter the DNA sequence itself and are often influenced by environmental factors. Holistic characteristics refer to an integrated approach to understanding biological systems, rather than a specific trait controlled by multiple genes. Thus, the concept of polygenic inheritance captures the essence of traits impacted by the cumulative effects of multiple genetic pathways.

A trait that is controlled by two or more genes is classified as a polygenic trait. Polygenic traits are influenced by multiple genes, often located on different chromosomes, and each of these genes contributes to the overall phenotype of the organism. This type of inheritance typically results in a continuous range of phenotypes, demonstrating the complexity and variability seen in traits such as height, skin color, and intelligence in humans.

In contrast, monogenic traits are controlled by a single gene, leading to distinct categories of phenotypes. Epigenetic traits involve changes in gene expression that do not alter the DNA sequence itself and are often influenced by environmental factors. Holistic characteristics refer to an integrated approach to understanding biological systems, rather than a specific trait controlled by multiple genes. Thus, the concept of polygenic inheritance captures the essence of traits impacted by the cumulative effects of multiple genetic pathways.