1. testcross

noun. a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring.


  • crossbreeding
  • crossing
  • hybridization
  • hybridisation
  • test-cross
  • hybridizing
  • interbreeding


  • lengthwise
  • uncross
  • unfold

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Sentences with testcross

1. Noun, singular or mass
They often use a method called a testcross, in which the organism is crossed with an organism who has a known genotype.