One example of epistasis is in the flowers of sweet pea plants. Two genes, A and
ID: 12460 • Letter: O
Question
One example of epistasis is in the flowers of sweet pea plants. Two genes, A and B, influence the production of flower color in one variety of sweet peas. For sweet peas to have purple flowers there must be a dominant A and B present. If th plant is homozygous recessive for A or B, then the plant will have white flowers. what is the phenotypic ratio of offspring from a cross between two plants heterozygous for the A and B genes? (remember epistasis. Please show your work and explain how you get you answer).
Explanation / Answer
AB
Ab
aB
ab
AB
AB AB
AB Ab
AB aB
AB ab
Ab
AB Ab
Ab Ab
Ab aB
Ab ab
aB
AB aB
Ab aB
aB aB
aB ab
ab
AB ab
Ab ab
aB ab
ab ab
genotypICs RATIO
1----- AABB
2 ------ AABb
1 ----------AAbb
2 --------AaBB
4------- AabB
2-----------Aabb
1-------- aaBB
2---aaBb
1---aabb
PhenotypIC RATIO = 9 PURPLE :7 WHITE
AB
Ab
aB
ab
AB
AB AB
AB Ab
AB aB
AB ab
Ab
AB Ab
Ab Ab
Ab aB
Ab ab
aB
AB aB
Ab aB
aB aB
aB ab
ab
AB ab
Ab ab
aB ab
ab ab
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