Question

A trait in garden peas involves the curling of leaves. A dihydrid cross was made involving a plant with yellow pods (yy) and curling leaves (cc) to a wild-type plant with green pods (YY) and normal leaves (CC). All F1 offspring had green pods and normal leaves. Suppose the Y(y) and C(c) alleles are not linked (the gene controlling pod color and the gene controlling leave characteristics inherit independently), The F1 plants were then crossed to plants with yellow pods and curling leaves, 1a. What are the phenotypes of offspring? 1b.What is the ratio among the number of offspring of each phenotype? If the F1 plants were self-fertilized, 1c. What are the phenotypes of the offspring? 1d. What is the ratio among the number of offspring of each phenotype?

Answer 1

Please look on the image for solution:

• Parents' tyck 1 X YY CC yellow curled green, normal УС gametes • Fi y c y ca F ís crossed with fellow and curled. - Parents, yc x ya y c y c Punnet square gametes) y uc УС T Y C Yettow Green poc y C Normal Leaves y el y c yellow pod y e curld Leaves to) Phenotypic ratio: - Green pod, Normal leavesli): Yellow pod, curled 11 (1) 1:1

C) Fi is self crossed Parents Y Yc yc C i x x y o g Punnet Punnet square - YC gametes. Y c . Yo lyycc | yYca yycc Yy Co Green pod Green poc green podl green pod, Normal Normal Normal Normal a deaves I Leaves I Leaves I leaves a yyca y cc Yuce dyy.cc Green pod l Greenpod | Yu Green I Green pod & I Normal Leaves curled I Normal leaf curled a leaf Jy y CC Yy Cc luy cc 1 Yy. Cica I Normal. I normal Normal Normal Leaves . | Leaf Leancs Yy CC lyycc | yy Cc I yy.cc = Green pod green pod / Yellowpod yellow Normal leurled normal I pod, I leaves I Leaf reaf kurled I Leaf Jl he green pod Yellow pool yellow pod . . leaf

D) phenotypic ratio:

Green pod, normal leaves(9): Green pod, curled leaves(3): Yellow pod, normal leaves (3) : yellow pod, curled leaves(1)

Or 9:3;3;1