Understanding Non-Mendelian Genetics

What does it mean when a trait is described as non-Mendelian?

• It does not involve alleles.

• There is not one clear dominant trait

• one trait is clearly dominant

• It can only be inherited from one parent.

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What type of dominance creates a blended phenotype?

• Incomplete dominance

• codominance

• mendelian dominance

• independent dominance

Answer explanation

Incomplete dominance means that there is going to be a blended phenotype. For example, if you cross a red flower with a white flower, you will get a pink flower.

What phenotype results from crossing two pink snapdragons?

• Only white flowers

• Only pink flowers

• Only red flowers

• Red, pink, or white flowers

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Which example illustrates codominance?

• A pink snapdragon resulting from a red and white parent

• A hairless guinea pig with two recessive alleles

• A tall child resulting from one tall and one short parent

• A speckled chicken resulting from black and white parents

Answer explanation

In codominance, how are the alleles expressed in the phenotype?

• Alleles blend into a new trait.

• Both alleles are fully expressed.

• One allele is dominant over the other.

• Both alleles are suppressed.

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In some species of chickens they display codominance. This means that crossing a black chicken and a white chicken would give you...

• Black Chickens

• White Chickens

• Gray Chickens

• Speckled (black and White Chickens)

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Skin color and height are examples of polygenic traits. What does polygenic mean?

• Many genes control the trait

• One gene controls the trait

• The gene is a unique shape

• The gene is larger than others

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What is a polygenic trait?

• A trait controlled by a single gene.

• A trait influenced only by environmental factors.

• A trait controlled by multiple genes.

• A trait that skips generations.

What does the term 'epistasis' refer to in genetics?

• A trait that does not follow Mendelian inheritance patterns

• A trait that is controlled by multiple alleles

• A situation where the environment controls the gene expression

• A form of dominance where one allele hides the effects of another allele

Wool color is controlled by epistasis in llamas. What happens if a llama inherits a cc?

• The llama is brown

• The llama is black

• The llama is albino

• The llama is angry