Labrador Coat Color Genetics Epistasis and Polygenic Inheritance Explained

This video tutorial covers the concepts of epistasis and polygenic inheritance. It begins with an explanation of epistasis, using Labrador Retrievers as an example to illustrate how the expression of one gene can affect another gene at a different locus. The video then transitions to polygenic inheritance, explaining how multiple genes contribute to quantitative traits like height and skin color. The tutorial concludes with information on additional resources and tutoring services available to Baylor students.

What is epistasis?

• A single gene affecting multiple traits

• The interaction of genes at different loci

• A gene that is always expressed

• A mutation in a single gene

In the context of Labrador Retrievers, what does the dominant allele at the first locus determine?

• The dog's temperament

• The dog's eye color

• The dog's size

• The dog's coat color

What happens if a Labrador Retriever has two recessive alleles at the second locus?

• The dog will have a yellow coat

• The dog will have a black coat

• The dog will have a brown coat

• The dog will have a white coat

What is the role of the second gene in determining Labrador Retriever coat color?

• It determines the dog's temperament

• It determines the dog's size

• It determines if pigment is deposited in the fur

• It determines the dog's eye color

What is the phenotypic outcome for a Labrador Retriever with the genotype little b, little b, little e, little e?

• Black coat

• Brown coat

• Yellow coat

• White coat

What is polygenic inheritance?

• A gene that is always expressed

• A single gene affecting multiple traits

• Multiple genes affecting a single trait

• A mutation in a single gene

Which of the following is an example of a trait influenced by polygenic inheritance?

• Eye color

• Height

• Hair texture

• Blood type

How does polygenic inheritance differ from single-gene inheritance?

• It involves only one gene

• It results in discrete phenotypes

• It involves multiple genes

• It is not influenced by the environment

Which of the following is NOT a characteristic of polygenic inheritance?

• Traits vary along a continuum

• Multiple genes influence a single trait

• Environmental factors can influence the trait

• Traits have distinct categories

Where can Baylor students find free tutoring services?

• In the library

• On the first floor of the Sid Richardson Building

• In the student union

• Online only