Polygenic Inheritance Review

What type of inheritance is determined by multiple genes and there can be a range of traits?

• Codominance

• Incomplete dominance

• Polygenic traits

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What type of distribution does polygenic inheritance follow?

• logistic growth

• exponential growth

• bell-shaped curve

This is when a trait is controlled by more than one gene.

• Multiple alleles
• Polygenetic inheritance
• Codominance
• Incomplete Dominance 

Examples include skin color and height (the individual's phenotype exists somewhere along a spectrum)

• polygenic inheritance

• multiple alleles

• linked genes

• incomplete dominance

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If a persons genotype was AABbCc for height. How many genes do they have for this trait?

• 6

• 3

• 4

• 5

Human eye color is controlled by three different genes, and affected by a dozen more. This is an example of:

• complete dominance

• incomplete dominance

• codominance

• polygenic inheritance

• multiple alleles

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People come in a wide variety of heights. What is the best explanation for this?

• complete dominance

• incomplete dominance

• codominance

• polygenic inheritance

• multiple alleles

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How do environmental factors interact with polygenic inheritance?

• Environmental factors can modify the phenotypic expression of polygenic traits.

• Environmental factors can completely override polygenic inheritance.

• Polygenic inheritance is solely determined by genetic factors.

• Environmental factors have no effect on polygenic inheritance.

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What are some examples of traits that are influenced by polygenic inheritance?

• Blood type, fingerprint pattern, earlobe shape

• Hair color, weight, shoe size

• Height, skin color, eye color

• Musical talent, athletic ability, sense of humor

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What is the role of multiple genes in polygenic inheritance?

• Multiple genes contribute to the expression of a trait.

• Polygenic inheritance is not influenced by multiple genes.

• Multiple genes have no effect on the expression of a trait.

• Only one gene is responsible for polygenic inheritance.