Genotype ratios

Question 1

9:3:3:1

Answer 1

dihybrid cross with complete dominance

9: A-;B- : 3 A-;bb : 3 aa;B- 1:aa;bb

Question 2

9:3:4

Answer 2

recessive epistasis
9A-;B- 3:A-;bb 4 aa;Bb or bb(1x)
-if you have aa masks whatever is on the B/b locus

Question 3

12:3:1

Answer 3

dominant epistasis
12A-;- 3aa;B- 1aa;bb
12x having one A one phenotype will mask the phenotype on the b/B locus,
-3x when no A but have B another phenotype
-1x homozygous recessive: another phenotype

Question 4

9:7

Answer 4

9x having both A and B= one phenotype

7x everything else another phenotype

Question 5

9:6:1

Answer 5

anything with both A and B= one phenotype
anything with just A or just B= one phenotype
aa;bb= another phenotype

Question 6

15:1

Answer 6

15x: any genotype with either A or B or both= one phenotype
1x: aa;bb = another phenotype

Question 7

13:3

Answer 7

combination of dominant epistasis
12x- when A then masks B
3x- when B without A
1x- aa;bb but looks like if it had the A so phenotypically count with the 12= 13x