1. 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
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How To Use testcross In A Sentence

  • Sixty-one triploid F 1 plants were crossed with diploid pollen donors for testcrosses.
  • If the mystery mutant and the known mutant sit on different chromosomes or a long way from each other on the same chromosome the grandkids of your ‘testcross’ will have an even mix of either one of the mutations, both or neither. Balloon Juice » 2006 » March
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