Test Cross
Under the law of dominance in genetics, an individual expressing a dominant phenotype could contain either two copies of the dominant allele (homozygous dominant) or one copy of each dominant and recessive allele (heterozygous dominant). By performing a test cross, one can determine whether the individual is heterozygous or homozygous dominant. In a test cross, the individual in question is bred with another individual that is homozygous for the recessive trait and the offspring of the test cross are examined. Since the homozygous recessive individual can only pass on recessive alleles, the allele the individual in question passes on determines the phenotype of the offspring. Thus, this test yields 2 possible situations: # If any of the offspring produced express the recessive trait, the individual in question is heterozygous for the dominant allele. # If all of the offspring produced express the dominant trait, the individual in question is homozygous for the dominant allele. ...
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Punnett Square Test Cross
Punnett is an English surname. Notable people with the surname include: * Ian Punnett (born 1960), American radio broadcaster, author, professor, and Episcopal Church (United States), Episcopal deacon * Phyllis Joyce McClean Punnett (1917–2004), Vincentian musician and writer * Reginald Punnett (1875–1967), British geneticist {{surname ...
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