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Q.

What is the purpose of a test cross in genetics?

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a

To determine the phenotypic ratio of the offspring

b

To determine the dominance of alleles

c

To determine the genotypic composition of an individual with a dominant phenotype

d

To increase the genetic variation in the offspring

answer is C.

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Detailed Solution

In a typical test cross an organism (pea plants here) showing a dominant phenotype (and whose genotype is to be determined) is crossed with the recessive parent instead of self-crossing. 

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