Step-by-Step Solution
In a certain plant, the flower petals are normally purple. Two recessive mutations arise in separate plants are found to be on different chromosomes. Mutation 1 (m1) gives blue petals when homozygous (m1/ m1).
Mutation 2 (m2) gives red petals when homozygous (m2/ m2). Biochemists who are working on the biosynthetic pathway of flower pigments in this particular species have already described the following pathway:
From the give data, the following question can be answered:
a. Mutant that is capable of synthesizing red petals would be the one that would be lacking the activity of enzyme A.
b. It produces purple colored petals as it resembles the wild type allele (the mutations are recessive too).
c. 9:3:3:1 – Purple (M1/-; M2/-); blue (m1/m1; M2/-); red (M1/-; m2/m2); white (m1/m1; m2/m2).
d. These mutants do not synthesize functional enzyme. To make sure the wild type strains produce the normal levels of pigment each allele should be involved in the synthesis of the functional enzyme that leads to the synthesis of pigments that imparts color.
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