NEET 2011 Biology question

Test cross in plants or in Drosophila involves crossing

(1)between two genotypes with recessive trait
(2)between two F hybrids
(3)the F hybrid with a double recessive genotype.Correct
(4)between two genotypes with dominant trait

Answer: (3)

Solution

A test cross is a cross of an individual showing the dominant phenotype (unknown genotype, e.g. the F hybrid) with a homozygous recessive parent (double recessive in a dihybrid case). The progeny reveal the genotype and, in dihybrid crosses, whether the genes are

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Question ID VK-090706