Yellow- seeded pea plants may be homozygous or heterozygous. To find out which, cross the plants with

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Crossing the yellow-seeded pea plants with true-breeding green-seeded plants (which are homozygous recessive) will reveal the genotype of the yellow-seeded plants. If any offspring have green seeds, the yellow-seeded plant is heterozygous. If all offspring have yellow seeds, the plant is homozygous.

Yellow- Seeded Pea Plants May Be Homozygous or Heterozygous