All plants produced in F2 generation may either have TT 01 IT genotypes. Mendel devised simple way to distinguish the genotype. It is known as lest cross. The oigantsins of dominant phenolype (tall) hut unknown genotype is crossed to homozygous recessive individual eg. a tall plant is crossed with a dwarf plant. It tall plant is homozygous (IT) and F1 plants would he tall (Tt) and one half dwarf (Tt) exhibiting a ration 1:1. This ratio is called test cross ratio.
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