APFIVE Characteristics Of Polygenic Inheritance
The table illustrates a model of polygenic inheritance, where multiple genes contribute to a single phenotype. All of the following statements accurately describe this pattern of inheritance EXCEPT:
| Gene | Contribution to Phenotype |
|---|---|
| Gene 1 | +2 units |
| Gene 2 | +3 units |
| Gene 3 | +1 unit |
| Total | Continuous, variable outcome |
A
Environmental factors may further influence the expression of polygenic traits in addition to the genetic contributions.
B
A polygenic trait is dictated by the effect of a single gene with a simple dominant-recessive relationship.
C
The phenotypic distribution of a polygenic trait in a population often approximates a normal distribution.
D
Multiple genes contribute additively to a polygenic trait, which usually results in continuous variation.
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