Justify the statement: Every test cross is a back cross but every back cross is not a test cross.

Asked by sharmistha.panda | 21st May, 2011, 12:00: AM

Expert Answer:

Back cross is a cross of a hybrid with one of its parents or any individual genetically similar to its parent in order to achieve offspring with genetic identity closer to that of the parent whereas a test cross is a type of back cross between the recessive homozygote and F1 generation.
If the individual being tested produces any recessive offspring its genotype is heterozygous and if all the offspring are phenotypically dominant, its genotype is homozygous.
Every test cross is a back cross but every back cross is not a test cross because in it F1 generation is crossed with one of the parent and is used to know the genotype of F1 generation.
 

Answered by  | 23rd May, 2011, 03:46: PM

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