The Parental cross – genotypes and phenotypes Let P = green stems and p = purple

Question

The Parental cross – genotypes and phenotypes

Let P = green stems and p = purple stems

Let B = green leaves and b = blue leaves

Your work for the F1 cross (showing parental gametes and the genotype and phenotype for the offspring)

List the possible gametes for the F1 cross (remember you are dealing with two traits, stems and leaves.)

Create a Punnett Square for the F1 cross.

List the phenotypes of the offspring and state how many of each phenotype there are in the Punnett Square.

Phenotype 1 ____________________________   __/16

Phenotype 2 ____________________________   __/16

Phenotype 3 ____________________________   __/16

Phenotype 4 ____________________________   __/16

State the ratio of the phenotypes. _______________________

Explanation / Answer

Parent generation PPBB (green stem and green leaves) X ppbb (purple stem and blue leaves)

gametes PB pb

F1 generation PpBb (green stem and green leaves) hybrid X PpBb

Gametes formation PB, Pb, pB, pb PB, Pb, pB, PB.

F2 Generation

Phenotype 1 Green stem and green leaves = 9/16.

Phenotype 2 Green stem and blue leaves = 3/16.

Phenotype 3 Purple stem and green leaves = 3/16.

Phenotype 4 Purple stem and blue leaves = 1/16.

Ratio of phenotype = 9:3:3:1.

male /female PB Pb pB pb PB PPBB(green stem and green leaves) PPBb(green stem and green leaves) PpBB( green stem and green leaves) PpBb(green stem and green leaves) Pb PPBb(green stem and green leaves) PPbb(green stem and blue leaves) PpBb(green stem and green leaves) PPbb(green stem and blue leaves) pB PpBB(green stem and green leaves) PpBb(green stem and green leaves) ppBB(purple stem and green leaves) ppBb(purple stem and green leaves) pb PpBb(green stem and green leaves) Ppbb(green stem and blue leaves) ppBb(purple stem and green leaves) ppbb(purple stem and blue leaves)

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