Biology 0610 · IGCSE · Monohybrid inheritance

Monohybrid inheritance — practice question

The diagram illustrates breeding rats in which the allele for grey fur is dominant over white fur. Which two individuals are certainly heterozygous for fur colour?

  • A1 and 4
  • B2 and 3
  • C2 and 5
  • D3 and 6

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