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Scientists often experiment with Brassica plants because Brassica plants grow very fast, and they produce seeds 30 days after being planted. This quick maturation allows scientists to study several generations of Brassica plants in a short time. Usually the scientists use Brassica plants to study genetics and inheritance.
In one investigation that studied the inheritance of Brassica stem color, scientists crossed a heterozygous dominant (Rr) plant with a homozygous recessive (rr) plant. This resulted in offspring with purple stems (RR or Rr) and offspring with green stems (rr). A Punnett square for this cross is shown below
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