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The law that best explains why an organism with the genotype Tt will exhibit only the dominant phenotype is the Law of Dominance. This principle, established by Gregor Mendel, states that in a heterozygous genotype, the dominant allele (T) masks the expression of the recessive allele (t). Consequently, the presence of one dominant allele is sufficient to produce the dominant phenotype, resulting in the organism displaying that trait.

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2mo ago

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To perform a testcross scientists cross an organism with an unknown genotype with a organism.?

If an individual is of the dominant phenotype, its genotype can be either AA or Aa (letter A picked for demonstration's sake). To do a good test cross, we have to be able to unambiguously tell which one of the genotypes the individual is. The best test cross would be conducted with a homozygous recessive (aa) individual. This way, if the cross generates 100% dominant phenotype, then the original individual was homozygous dominant. If the cross generates 50% dominant and 50% recessive phenotype, then the original individual was heterozygous.


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If you're given a general situation, it's best to make one up of your own and see the results. Say the dominant trait is B and the recessive trait is b. Therefore, a heterozygote would be Bb. If you cross a Bb with a Bb, you will get BB, Bb, Bb, and bb. Any offspring with just one dominant allele will have the dominant trait. So three of the four (75%) are phenotypically dominant and one of the four (25%) is phenotypically recessive.


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