Topic 13 pt 2: Gene Interaction Flashcards
Types of epistasis
Recessive epistasis
Dominant epistasis
Duplicate recessive epistasis
Duplicate dominant epistasis
Ratios for F2 in types of epistasis
Rec epi = 9:3:4
Dom epi = 12:3:1
Dup rec epi = 9:7
Dup dom epi = 15:1
Example of recessive epistasis (explain), ratio in F2
Labrador retriever coat colour, “ee” is epistatic over the B locus (determines black or brown)
9:3:4
Example of dominant epistasis (explain), ratio in F2
Colour in squash, big W leads to white colour in all cases)
12:3:1
Example of duplicate recessive epistasis (explain), ratio in F2
Snail pigmentation, having either aa OR bb leads to albino snail
9:7
Example of duplicate dominant epistasis (explain), ratio in F2
Locus T in capsella bursa-pastoris, having large T or V will lead to heart shape
15:1
Look at all slides and examples at end!!
Important