When multiple genes affect a single phenotypic trait.Group of answer choicespolygenicepistasiscodominancepleiotropyincomplete dominancemultifactorialNext
Question
When multiple genes affect a single phenotypic trait.
- Group of answer choices
- polygenic
- epistasis
- codominance
- pleiotropy
- incomplete dominance
- multifactorial
Next
Solution
The correct answer to the question "When multiple genes affect a single phenotypic trait" is polygenic.
Explanation:
In genetics, polygenic inheritance refers to a single phenotypic trait that is influenced by multiple genes, each contributing to the phenotype in varying degrees. This is common for traits such as skin color, height, and weight in humans, where several genes interact to determine the outcome.
- Epistasis refers to the interaction between different genes, where one gene may mask or alter the expression of another.
- Codominance occurs when two alleles in a heterozygote are both fully expressed.
- Pleiotropy involves a single gene influencing multiple phenotypic traits.
- Incomplete dominance is when the phenotype of heterozygotes is intermediate between the two homozygotes.
- Multifactorial traits are influenced by both genetic (polygenic) and environmental factors.
Therefore, polygenic is the best choice based on the description provided.
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If the phenotype reflects the activities of more than one gene, it is called a ______ trait.Multiple choice question.
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