Problem 2 In snapdragon flowers, a gene for stature has two alleles. Tallness (T

Question

Problem 2 In snapdragon flowers, a gene for stature has two alleles. Tallness (T) is a dominant allele, and dwarfness (t) is a recessive allele. A second gene for flower color also has two alleles. Red (R) flower color is incompletely dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and which has pink flowers. What is the probability of producing a tall plant with red flowers? Use a Punnett Square to solve this problem and show your work.

Explanation / Answer

When Mendel self pollinated the F2 plants .he discovered that seeded offsprings that the green seeded F2 gave rise to green seeded offspring only whereas V of the flower seeded plants in the F2 generation gave rise to yellow seeded offspring only V,of the F2 yellow -seeded plan rise to an interesting mixture 1/4green seeded and 3/4 yellow seeded.Mendel regarded the F2 which gave rise to a mixture off spring as impure dominants

F2 :impure dominant yellow seeded

F3:3/4yellow seeds:1/4 green seeds

As the impure dominant represented percentage of the yellow seeded offspring F2or 3/3 of the original 3 percentage yellow seeded it is understandable that the impure dominants compromise 1/2 of all the generation 1/4 yellow seeds 1/4 pure dominant 1/2 impure dominant V4green seeds A pure

Rescesive

Therefore Mendel concluded that there was a 1.2.1 genotypic ratio underlying the 3.1 the phenotypic ratio

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