Question

what is back cross and test cross

Answer 1

Back cross- When F1 individuals are crossed with one of the two parents from which they were derived, then such a cross is called a back cross.

In such back crosses, when F1 is back crossed with the parent having dominant characters (phenotype), no recessive individuals are obtained. Again when crossed with recessive parent, both phenotypes appear in the progeny.

Test cross- A test cross is a cross used to test whether an individual is homozygous ie pure or heterozygous ie hybrid. It is always crossed with a recessive parent.

Answer 2

Answer:

Back cross :

It is the cross made between F1 hybrids with any one of its parents.

Test cross :

It is a cross made between F1 hybrid with its double recessive parents to confirm homozygus or heterozygous condition of F1 hybrid.

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