1. list the distances between each pair of genes:

beak color and tail-feather length:

beak color and feather color:

tail-feather length and feather color:

2. which two alleles are the farthest apart?

3. which two alleles are the closest together?

20MU

16MU

4MU

2.Beak color and tail feather length

3.Tail feather length and feather color

RESPECTIVELY

Explanation:

Distance between beak color and tail feather length is 20 MU

Distance between beak color and feather color is 16MU

Distance between tail feather length and feather color is 4MU

2.Beak color and tail feather length are the two most farthest alleles

3.Tail feather length and feather color are the closet alleles

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .