In examining M. rattus, you realize that the animal has many eyecolors. You perform the following crosses.
Cross Parents Progeny (ratio of phenotypes)
1 blue eye X yelloweye all green
2 blue eye X blueeye 3 blue : 1 red
3 blue eye X browneye 1 blue : 1 green : 1 yellow: 1 red
4 yellow eye X redeye 2 red : 1 yellow: 1 brown
a) What is the pattern of dominance for eye color? Show yourwork.
b) What phenotypic ratio would you see if you mated the blue eyeanimal in cross 3 with the red eye animal in cross 4?