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Define and design a test cross....

Define and design a test cross.

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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.
= If the progenies produced by a test cross show 50% dominant trait and 50% recessive trait, then the unknown individual is heterozygous for a trait.
= On the other hand if the progeny produced shows dominant trait, then the unknown individual is homozygous for a trait.

= If the unknown is homozygous tall (TT) then crossing with dwarf recessive (tt) gives all tall offsprings (Tt).

= If the unknown is heterozygous tall [Tt], then crossing with dwarf (tt) results in 50% tall (Tt) and 50% dwarf (tt) progeny
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