If doubly heterozygous SsNn cactuses were allowed to self-pollinate, the F2 would segregate in which of the f?

Question

If doubly heterozygous SsNn cactuses were allowed to self-pollinate, the F2 would segregate in which of the following ratios?


a.3 sharp-spined : 1 spineless

b. 1 sharp-spined : 2 dull-spined : 1 spineless

c. 1 sharp spined : 1 dull-spined : 1 spineless

d. 1 sharp-spined : 1 dull-spined

e. 9 sharp-spined : 3 dull-spined : 4 spineless

Answer 1

b) The F2 would segregate 1:2:1ratio

Answer 2

It should be a 9:3:3:1 ratio.
I'd go with e so, i think dull spined are co-dominant