Question

In snapdragons, the plant height gene and the flower color genes are located on different chromosomes....

In snapdragons, the plant height gene and the flower color genes are located on different chromosomes. Tall (T) is dominant to dwarf (t). Red flowers (FR) are incompletely dominant to white (FW), with the hybrid being pink. A homozygous tall-white is crossed to a homozygous dwarf-red,. The F1 plants are then self-fertilized to produce an F2 generation.

a. What is the genotype and phenotype of the F1?

b. What proportion of the F2 will have pink flowers?

c. What proportion of the F2 will be tall?

d. What proportion of the F2 will be tall and have pink flower

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Answer #1

Let's do first parental cross to know F1

The parents are

homozygous tall-white and genotype must be TTWW is crossed to a homozygous dwarf-red the genotype will be it. Here R allele is for Red colour flower. And W for white colour flower.

Now by crossing

TTWW x the

F1 TtRW. Is genotype

Phenotype is Tall Pink

Self cross of F1

TtRW x TtRW

The 8/16 are Pink flower plants i.e 50%

The 12/16 are tall plant i.e 75%

The 6/16 are tall and pink colour flower plants i.e 37.5% genotype is highlighted in yellow colour.

Thanks

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