In Japanese four o'clock plants red (R) color is incompletely dominant over white (R') flowers, and the heterozygous condition (
RR') results in plants with pink flowers. For each of the following construct a Punnett square and give phenotypic and genotype ratios of the offspring.
a. a red plant and a white plant
RR R'
R R R'
Genotypic ratios:
Phenotypic ratios:
a. a red plant and a white plant
RR R'
R R R'
Genotypic ratios:
Phenotypic ratios:
1 answer:
Answer:
Phenotypic ratio: 0 Red : 4 Pink : 0 White
Genotypic ratio: 0RR : 4RR' : 0R'R'
Explanation:
This question involves a single gene coding for flower colour in Japanese four o'clock plants. The allele for red color (R) exhibits incomplete dominance over the allele for white color (R'), hence, they form a hybrid (RR') that is blending of both phenotypes (Pink).
In a cross between a red plant (RR) and white plant (R'R'), red and white four o'clock plant will produce gametes R and R' respectively. Using these gametes in a punnet square (see attached image), four possible offsprings that all have a genotype: RR' will be produced. This means that all offsprings of this cross are pink colored.
Therefore,
Genotypic ratio= 0RR : 4RR' : 0R'R'
Phenotypic ratio= 0Red : 4Pink : 0White
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