Ratios (Phenotypic, assuming heterozygote)

Question 1

9:3:3:1

Answer 1

No interaction

Question 2

9:7

Answer 2

Genes in the same pathway

Question 3

9:3:4

Answer 3

Recessive epistasis

Question 4

12:3:1

Answer 4

Dominant epistasis

Question 5

13:3

Answer 5

Supressor has no phenotype

Question 6

14:2

Answer 6

Supressor is like mutant

Question 7

Genotypes of recessive epistasis given AaBbxAaBb and a epistatic to b

Answer 7

9 (A_ B_) : 3 (A_ bb) : 4 (3 aa B_ + 1 aa
bb)

Question 8

Genotypes of dominant epistasis given AaBbxAaBb where a is epistatic to b

Answer 8

12 (A_ B_ + A_ bb) : 3 (aa B_) : 1 (aa bb)

Question 9

1:2

Answer 9

homozygote is lethal

Question 10

1:2:1

Answer 10

Incomplete dominance/codominant

Question 11

1:1

Answer 11

Monohybrid testcrossed

Question 12

1:1:1:1

Answer 12

Dihybrid testcrossed

Question 13

Give the genotypes of AaBbxAaBb when the suppressor has no phenotype

Answer 13

13 wild type: (9:A/- S/- 3:A/- s/s 1:a/a s/s) 3 mutant: (a/a S/-)

Question 14

Give the genotypes of MmSsxMmSs when the suppressor is like mutant

Answer 14

14 wild type: (9:M/- S/- 2:Mm ss 2:mm Ss 1:mm/ss) 2 mutant: (1: MM ss 1: mm SS)