The crossing of an organism with a double (homozygous) recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is known as

Back cross

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Test cross

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Reciprocal cross

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Dihybrid cross

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Solution

The correct option is B Test cross
In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of an 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.
Those that are heterozygous have one dominant and one recessive allele Individuals that are homozygous dominant have two dominant alleles, and those that are homozygous recessive have two recessive alleles. Hence option B is correct.

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Q. Mating of an organism to double recessive in order to determine whether it is homozygous or heterozygous for a character is called ____________.

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