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Testcross

  • Definition: A genetic cross used to determine the genotype (homozygous versus heterozygous) of an individual showing a genetically dominant phenotype. The individual tested is crossed to a homozygous recessive individual. Homozygous individuals tested produce only offspring with the dominant phenotype, whereas heterozygous individuals produce offspring with approximately even numbers of dominant and recessive phenotypes.

    Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.

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