Question

define and design a test cross ?

Answer 1

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Test cross is a cross between an organism with unknown genotype and a recessive parent. It is used to determine whether the individual is homozygous or heterozygous for a trait.Crossing of F1 individual having dominant phenotype with its homozygous recessive parent is called test cross. The test cross is used to determine whether the individuals exhibiting dominant character are homozygous or heterozygous.
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Answer 2

A cross between an organism of f1 generation and a homozygous recessive parent is a test cross. The offsprings obtained from this cross show same genotype and phenotype ratio ,i.e.,1:1. The ratio will be 50% (heterozygous tall,Tt) dominant and 50%(homozygous dwarf,tt) recessive.