Test cross, Biology


Crossing of F hybrid with its homozygous recessive parent is called test cross and the progeny of test cross is called test cross progeny.

A .      Monohybrid Test Cross

1773_monohybrid test cross.png

Thus monohybrid test cross ratio = 1 : 1

B .      Dihybrid Test Cross

1691_dihybrid test cross.png

So dihybrid test cross ratio = 1 : 1 : 1 : 1

C.      Trihybrid Test Cross

It involves crossing of a trihybrid (Rr Yy Cc) with triple recessive (rr yy cc). The eight different phenotypes will be obtained in 1 : 1 : 1 : 1 : 1 : 1 : 1 : 1 ratio.

Uses of a Test Cross

The test cross reveals the genotype of an organism displaying the dominant phenotype, hence its name.

Posted Date: 10/10/2012 4:07:09 AM | Location : United States

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