Multiple Choice
A diploid individual carrying two different alleles at a given gene locus is called:
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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If the phenotype reflects the activities of more than one gene, it is called a ______ trait.
A
monogenic
B
codominant
C
incompletely dominant
D
polygenic
Verified step by step guidance1
Understand the definition of the term 'polygenic trait': it refers to a phenotype that is influenced by the combined effects of more than one gene.
Recall that 'monogenic' traits are controlled by a single gene, so this does not fit the description of multiple genes affecting the phenotype.
Recognize that 'codominant' and 'incompletely dominant' describe specific types of gene interactions at a single gene locus, not multiple genes contributing to a trait.
Identify that when multiple genes contribute additively or interactively to a phenotype, the trait is called 'polygenic'.
Conclude that the correct term to fill in the blank is 'polygenic' because it best describes a trait influenced by more than one gene.
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