Question

Question 29 You find a red and white (both colors on one flower) geranium in your flowerbed of red geraniums. Seeds from self fertilization of this plant produce ¼ red plants, ½ red and white plants, and ¼ white plants. When considering the visible phenotype, which explanation is most likely?

A. The red and white plant had a new mutation, creating an allele to which the wildtype red is co-dominant

B. The red and white plant had a mutation, creating an allele to which is incompletely dominant to red

C. The soil in which the red and white plant was growing is deficient in nutrients

Answer 1

Option -A is correct. The red and white plant had a new mutation, creating an allele to which the wildtype red is co-dominant. From the cross, understandably, some mutation occurs in the germanium which leads to give 1 red plant, 2 red and white plant, and 1 white plant. from this it can be stated that mutation has made the expression of two alleles equally dominant to each other that's why they 2 plants show both red and white traits that are codominant.

Other option B states that mutation occurs and the allele is incompletely dominant to red is incorrect as it does not justify the results as 2 plants produce both red and white flower which shows codominance. From the deficiency of nutrients in the soil we cannot predict the mutations in the genotype of the plant so this is also incorrect.