Question

There are three traits in mice that are found on the same chromosome (they are linked). Gray fur is dominant to brown fur, long tails are dominant to short tails, and notched ears are dominant to unnotched ears.

A female mouse who is heterozygous is crossed with a male who is homozygous recessive. The observed offspring are shown below:

# offspring.	fur color.	tail length	ear shape
372	gray	long	notched
41	gray	short	notched
2	gray	long	unnotched
36	gray	short	unnotched
31	brown	long	notched
3	brown	short	notched
39	brown	long	unnotched
385	brown	short	unnotched

What are the phenotypes of the two parental (nonrecombinant) chromosomes:

1. fur: tail: ears

2. fur: tail: ears

3. What is the order in which these genes are found on the chromosome? (identify the middle gene, the other two can be either order) Genes are: fur color, tail length, ear shape

: :

4. What is the map distance between fur color and tail length?

5. What is the map distance between tail length and ear shape?

Answer 1