Gregor Mendel devised the fundamental tool of the test cross. It is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype .
A cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait
If all the offspring of a testcross are alike and resemble the organism being tested then the parent is homozygous.
homozygous recessive
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.
Do a testcross with a homozygous recessive plant.
no
genotype
If all the offspring of a testcross are alike and resemble the organism being tested then the parent is homozygous.
testcross
Do a testcross with a homozygous recessive plant.
Do a testcross with a homozygous recessive plant.
It would be around 50%.
Do a testcross with a homozygous recessive plant.
Do a testcross with a homozygous recessive plant.
homozygous recessive
Do a testcross with a homozygous recessive plant.
Do a testcross with a homozygous recessive plant.
Do a testcross with a homozygous recessive plant.