In snapdragons, the allele that produces tall stems is completely dominant to the allele for dwarf stems,?

while the allele that produces red flowers is only partially dominant to that of white flowers. Describe the phentype (height and flower color) of the F1 plants reulting from a cross between a homozygous tall, red flowerred plant and homozygous dwarf, white flowered plant.If one of these F1 plants self-pollinates, what will be the appearance and proportions of phenotype in the resulting F2 generation? Which one of these two phentypes will breed true?

In snapdragons, the allele that produces tall stems is completely dominant to the allele for dwarf stems,?
1. When a homozygous tall, red flowered plant and homozygous dwarf, white flowered plant mate, the resulting F1 plant is as follows:


F1= height (tall)


color (red)


This is due to the tall red dominant trait is paired with a recessive white dwarf.





2. If one of these F1 plants self-pollinates to create an F2, the outcome depends on the chromosomes carried creating several variations. A Punnett Square can be used to show that. You would have the following variations:


9 red, tall


3 red, dwarfs


3 white, tall


1 white, dwarf


or as a 9:3:3:1 ratio





3. The phenotype which will breed true is the F2, since F1’s created tall red plants, so those tall red plants would create different variations like the above 9:3:3:1 ratio, and you are bound to get a pure one.
Reply:So you've got a TTrr x ttww, which would produce Ttrw F1 generation. It would be tall and pink, since tall is dominant and color is miscible. If the Ttrw selfs, it will give 1 short white, 1 short red, 2 short pink, 3 tall red, 3 tall white, 6 tall pink. Only the tallness will breed true.

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