R is the allele for red petals and r is the allele for blue petals which term describes the offspring of the cross represented by flower Z
When ever the R gene is present in the genotype of a plant, the flower color is always red. The mutant form of this gene, which is recessive, is often written r. Plants with the genotype RR or Rr have red flowers. Plants with the genotype rr have white flowers.
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