Concept #1: Chi Square and Linkage

Practice: Black(B) rabbit coat colors are dominant to white(b) coat colors. Long hair (H) is dominant to short hair (h). A breeder crosses a rabbit homozygous for white, short hair with a homozygous black rabbit with long hair. The F1 is backcrossed to the rabbit with white, short hair and the following progeny are produced. Use the chi-square test to answer the following questions.

What are the expected offspring numbers if the two genes are not linked, and therefore assort independently? 

Practice: Calculate the chi-square value for the above problem. 

Practice: In this example, how many degrees of freedom should be used?

Practice: Using the appropriate chi-square value and degrees of freedom, do the coat color and hair length genes assort independently?