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Question :Define and design a test cross.

Answer»

SOLUTION :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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