4. What phenotypic ratio is produced in a dihybrid cross with recessive epistasis?
I. 9:3:3:1
II. 9:7
III. 1:2:1
IV. 9:3:4
a. I. and III.
b. II. and IV.
c. II. only
d. III. only
e. IV. only
I. 9:3:3:1
II. 9:7
III. 1:2:1
IV. 9:3:4
a. I. and III.
b. II. and IV.
c. II. only
d. III. only
e. IV. only