Monday, September 28, 2009

Test Cross (Short Note)

Tall plants produce in F2 generation may either have TT or Tt genotypes. Mendel devised simple way to distinguish the genotype. It is known as test cross. The organism of dominant phenotype (tall) but unknown genotype is crossed to homozygous recessive individual. For example a tall plant is crossed with a dwarf plant. If the tall plant is homozygous (TT), all F1 plants would be tall. But if the tall plant is heterozygous (Tt), one half one F1 plants would be tall (tt) and one half dwarf (tt) exhibiting ratio of 1:1. This ratio is called test cross ratio.

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