Question

11) purple flowers are dominant to white flowers in the jimsonweed plant. when a particular purple-flowered jimsonweed is self-pollinated, there are 28 purple-flowered and 10 white-flowered plants in the F1 generation. What are the genotypes of the parents? What is the phenotypic and genotypic ratio of the F1 Generation

Answer 1

the parents are both heterozygous (Pp) the genotypic ratio is 1:2:1 (PP:Pp:pp) and the phenotypic ratio is 3:1 (PP&Pp:pp)

Answer 2

a) Genotypes of the parents - Pp

b) Phenotypic ratio -
`3:1`

c) genotypic ration -
`1:2:1`

Step-by-step explanation:

It is given that 28 purple and 10 white flowered plants are produced in first generation.

Thus, genotype of the parents could be

Pp X Pp

As only then offspring with genotype PP, Pp, Pp, pp will be produced.

Thus, the phenotypic ratio would
`3:1` as PP, Pp Pp are purple flowered plant while pp is white flowered plant.

Genotypic ration would be PP:Pp:pp
`= 1:2:1`

a) Genotypes of the parents - Pp

b) Phenotypic ratio -
`3:1`

c) genotypic ration -
`1:2:1`