A test cross is a cross between an organism with unknown genotype and

Phenotypically recessive organism

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Homozygous dominant organism

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Heterozygous organism

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None of the above

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Solution

The correct option is A Phenotypically recessive organism
A test cross can distinguish the pure dominant from the impure dominant.
In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of a phenotypically dominant individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes. Zygosity can either be heterozygous or homozygous.

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An organism with a homozygous recessive genotype is made to undergo a test cross which results in 50% of the offspring exhibiting the recessive trait. The test cross parent is:

I. Homozygous recessive

II. Homozygous dominant

III. Heterozygous

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