. In a certain plant, the flower petals are normally purple.
Two recessive mutations arise in separate plants and 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 working on the synthesis of flower pigments in this species have already described the following pathway:
colorless (white)
compound
blue pigment
red pigment
enzyme A
enzyme B
a. Which mutant would you expect to be deficient in
enzyme A activity?
b. A plant has the genotype M1/m1 ; M2/m2. What
would you expect its
c. If the plant in part b is selfed, what colors of progeny
would you expect and in what proportions?
d. Why are these mutants recessive?
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