NEET 2006 Biology question

Test cross involves-

(1)Crossing between two genotypes with recessive trait
(2)Crossing between two F hybrids
(3)Crossing the F hybrid with a double recessive genotypeCorrect
(4)Crossing between two genotypes with dominant trait

Answer: (3)

Solution

A test cross is a cross of an individual of unknown genotype showing the dominant phenotype (e.g. an F1 hybrid) with the homozygous recessive parent. The phenotypes of the progeny reveal whether the tested individual is homozygous or heterozygous (1:1 ratio for a monohybrid test cross, 1:1:1:1 for a

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Question ID VK-089705