HELP!! RELATIVELY QUICKLY PLEASE!!

A snapdragon is a type of flowering plant. In snapdragons, the allele for red flowers (R) is incompletely dominant over the allele for white flowers (r).

Part A: Predict the phenotype that will be expressed by a snapdragon that is heterozygous for flower color (Rr).

Part B: Suppose two snapdragons that are heterozygous for flower color (Rr) are crossed. Predict the percentage of each possible phenotype that will result from this cross. In your answer, be sure to explain the reasoning behind your prediction.

Part C: A gardener wants to produce a generation of snapdragons that displays only the phenotype associated with the heterozygous genotype (Rr). Determine the genotypes and phenotypes of the snapdragons the gardener should cross to accomplish this goal. In your answer, be sure to explain the reasoning behind your decision.

Question

22-01-2017
Biology

contestada

HELP!! RELATIVELY QUICKLY PLEASE!!

A snapdragon is a type of flowering plant. In snapdragons, the allele for red flowers (R) is incompletely dominant over the allele for white flowers (r).

Part A: Predict the phenotype that will be expressed by a snapdragon that is heterozygous for flower color (Rr).

Part B: Suppose two snapdragons that are heterozygous for flower color (Rr) are crossed. Predict the percentage of each possible phenotype that will result from this cross. In your answer, be sure to explain the reasoning behind your prediction.

Part C: A gardener wants to produce a generation of snapdragons that displays only the phenotype associated with the heterozygous genotype (Rr). Determine the genotypes and phenotypes of the snapdragons the gardener should cross to accomplish this goal. In your answer, be sure to explain the reasoning behind your decision.

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kimberleystutel kimberleystutel · Answer 1 · 2017-02-02T11:42:03+01:00

Okay, first the clear up. The Homozygous dominate trait is RR and is Red, the Heterozygous trait is Rr and is Pink, and the Homozygous recessive trait is rr and is white.

Part A: The co-dominance or incomplete dominance mixes the colours together, so the phenotype for the Heterozygous Rr flower is pink.

Part B: This question is easiest to explain with a punnet square... so. Diagram attached.

Part C: To get only Heterozygous genotypes, the gardener must cross only White flowers with red flowers. Because both these flowers are homozygous pairs, it means that any offspring created from that group would have a mix of the two. This is clearly seen in the F1 generation of Mendel's experiments for further proof. If any other pair is chosen ie Red with red: all red offspring, white and white, all white offspring. Pink and pink, a 1:2:! ratio. Red and Pink: 1:1 ratio of red and pink. White and pink: 1:1 ratio of pink and white. Red and white: Only pink offspring.

Hope that helps, message if you need it explained.