A scientist is curious about the inheritance of fur color and tail length in mice. She suspects that the genes that affect these traits are located on the same chromosome but wants to formally test this hypothesis. In order to do so, she bred two mice: one mouse has white fur and a long tail while the other mouse has black fur and a stubby tail. In one year, they produced 43 offspring. 20 offspring were white with long tails. 13 offspring were black with stubby tails. 7 offspring were white with stubby tails. 3 offspring were black with long tails. What is the recombination frequency of these genes? Is the scientist’s hypothesis supported or rejected? Why?

Match the stage of the cell cycle to the number corresponding to the stage in the image below.    

Males always inherit their Y chromosomes from their fathers.

Alterations/modification to chromosome structure cannot negatively influence organismal survival as long as all of the genes in the genome are retained.

A man (Greg; normal vision) and a woman (Stacy; normal vision) decide to have a baby. Stacy happens to have a color-blind father and a mother with normal vision (color-blindness is X-linked recessive). What proportion of Greg and Stacy’s offspring would we expect to be colorblind? What proportion would we expect to be carriers?

Explain how Barr bodies influence patterns of phenotypic expression (e.g. how something looks).

Select all option below that could be considered a phenotypic character.

Animals tolerate polyploidy better than plants.

Each species has a characteristic number of chromosomes.

The parents you inherited a gene from can influence the expression of that gene.