What does polygenic inheritance involve?

What does polygenic inheritance involve?

• A. A single gene influencing multiple traits
• B. Multiple genes influencing a single trait
• C. A blend of dominant and recessive traits
• D. Traits that are determined solely by environmental factors

Answer: (B)

Polygenic inheritance involves multiple genes influencing a single trait. In this mode of inheritance, the combined effects of several genes contribute to a phenotype, meaning that traits are typically quantitative and can exhibit a wide range of variation. This is often seen in traits such as height, skin color, or weight, where the contributions of numerous alleles result in a continuous spectrum of phenotypes rather than discrete categories. The complexity of polygenic traits arises because each involved gene may have multiple alleles and can interact with other genes, leading to the expression of the trait being influenced by the additive effects of these alleles. This principle helps explain why, for example, offspring may resemble their parents in more subtle ways than a simple dominant-recessive model would suggest.

Polygenic inheritance involves multiple genes influencing a single trait. In this mode of inheritance, the combined effects of several genes contribute to a phenotype, meaning that traits are typically quantitative and can exhibit a wide range of variation. This is often seen in traits such as height, skin color, or weight, where the contributions of numerous alleles result in a continuous spectrum of phenotypes rather than discrete categories.

The complexity of polygenic traits arises because each involved gene may have multiple alleles and can interact with other genes, leading to the expression of the trait being influenced by the additive effects of these alleles. This principle helps explain why, for example, offspring may resemble their parents in more subtle ways than a simple dominant-recessive model would suggest.