Polygenic Inheritance

What is polygenic inheritance?

• Polygenic inheritance is a type of inheritance pattern where only one parent passes on the genes for a trait.

• Polygenic inheritance is a type of inheritance pattern where environmental factors contribute to the phenotype of a trait.

• Polygenic inheritance is a type of inheritance pattern where a single gene contributes to the phenotype of a trait.

• Polygenic inheritance is a type of inheritance pattern where multiple genes contribute to the phenotype of a trait.

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.

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

What are the limitations of polygenic inheritance studies?

• Polygenic inheritance studies are not applicable to humans

• Polygenic inheritance studies are only applicable to single-gene traits

• Polygenic inheritance studies cannot determine the exact contribution of each gene

• The limitations of polygenic inheritance studies include the difficulty in identifying and quantifying all the contributing genes, the influence of environmental factors, and the challenge of distinguishing between genetic and environmental effects.

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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Labrador retriever's fur color is an example of epistasis. In this case the E gene controls the expression of the B gene. It a puppy was born with the genotype eeBB its fur color would be ________ and if it was born with the genotype EEbb it would be __________

• yellow, yellow

• yellow, black

• chocolate, black

• yellow, chocolate

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The genetic determination of dogs’ coats can be quite complex, with many different genes acting at the same time.

• The dominant allele E gives brown tones. The recessive allele e results in red tones.
• The color intensity is due to another gene. The dominant allele B gives a dark color, whereas the recessive allele b results in a light color.

What would be the genotype of a light brown dog produced from a cross between a dark brown dog and a light red dog?

• EEbb

• EeBb

• eeBb

• Eebb

Answer explanation

Since the dog is brown we know it has E, but since one of the parents is red, we can assume it is Ee. Since the dog is light in terms of color intensity, we can assume it is homozygous recessive since a B would mean darker shades.

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The image shows variation in height of adult humans. What can explain the variation?

• One pair of alleles and age

• Polygenic inheritance and nutrition

• Nutrition and age

• Autosomal inheritance only

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