in a testcross, if all the offspring show the dominant phenotype, then the individual with the unknown genotype was:

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19-12-2022
Biology

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in a testcross, if all the offspring show the dominant phenotype, then the individual with the unknown genotype was:

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AnnuG AnnuG · Answer 1 · 2022-12-21T13:58:09-05:00

The homozygous dominant genotype will show all dominant offspring in test cross.

To as certain whether or not the dominant trait is heterozygous, a text cross between a person expressing a recessive trait and one exhibiting a dominant trait is performed. An individual expressing a dominant trait could have two copies of the dominant allele (homozygous dominant) or one copy of each dominant and recessive allele, according to the law of dominance in genetics (heterozygous dominant). A test cross can be used to ascertain whether a person is homozygous dominant or heterozygous dominant. An individual is bred with another who is homozygous for the recessive trait in a test cross, and the children of the test cross are then evaluated. The allele that the homozygous recessive person passes on determines the phenotype of the progeny because they can only transmit recessive alleles. Thus, this test has two potential outcomes:

Hence, test cross is used to determine genotype of offspring.

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