Question

1.)

Women with mutations in their BRCA1 or BRCA2 genes are more likely to suffer from breast or ovarian cancer at some point in their life than those who are wild-type. However, doctors cannot predict which patients will develop cancer and which patients won’t. Which term best describes the relationship between BRCA1 (or BRCA2) and cancer?

		Incomplete Penetrance
		Variable Expressivity
		Both
		Neither

2.)

Coat color in Labrador retrievers is determined by two alleles at each of two loci Bb and Ee. Dihybrid crosses produce 9:3:4 black:chocolate:yellow offspring. What can be concluded about the B and E alleles with respect to coat color?

		They are epistatic
		They are not epistatic
		They are in the same biochemical pathway
		They are in different biochemical pathways

Answer 1

Answer:-

1) Incomplete penetrance is the best term that describes the relationship between BRCA1(or BRCA2) and cancer.

2)The B and E alleles are epistatic with respect to coat colour