Respuesta :
A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has one genotype
What is test cross?
- Gregor Mendel used the test cross experiment for the first time in his research on the genetics of characteristics in pea plants.
- According to Mendel's idea, which is still valid today, every creature has two copies of each characteristic.
- One was a dominant characteristic, while the other was recessive.
- If existent, the dominant characteristic would dictate the phenotype, or the phenotypical makeup of the organism.
- Mendel intended to take these steps to ensure that he was working with a homozygous dominant organism, or one that solely contained dominant alleles.
- However, the genotype of an organism cannot be determined only from its phenotype.
- The organism could be concealing a non-expressed, recessive gene.
- Mendel devised the method of mating this individual with a homozygous recessive individual for the same trait in order to identify this unknown allele.
Examples of test cross:
- Monohybrid cross
- Dihybrid cross
Hence, A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has one genotype
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