In a particular plant, two genes control leaf shape and color. Round leaves (R) are dominant to jagg

Question

In a particular plant, two genes control leaf shape and color. Round leaves (R) are dominant to jagged leaves (r). Yellow fruits (Y) are dominant to white fruits (y). A true-breeding round-leaved, yellow-fruited plant is mated with a jagged-leaved, white-fruited plant. What are the genotypes of the plants involved in this cross?

Accepted Answer

Sol.(b) [Key Concept: Dihybrid Cross — Parental Genotypes] True-breeding round-leaved, yellow-fruited plant must be homozygous dominant: RRYY. Jagged-leaved, white-fruited plant must be homozygous recessive: rryy. So the cross is RRYY × rryy. The F1 will all be RrYy (round-leaved, yellow-fruited heterozygotes). Option (c) would be a cross between two F1 hybrids; option (d) would be a test cross.

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