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Questions  

In testcross :

a
The organism expressing the dominant phenotype but having an unknown genotype is crossed with a known homozygous recessive individual.
b
The organism expressing the dominant phenotype but having an unknown genotype is crossed with a known heterozygous dominant individual.
c
The organism expressing the recessive phenotype is crossed with a known homozygous dominant individual.
d
The organism expressing the recessive phenotype is crossed with a known heterozygous dominant individual.

detailed solution

Correct option is A

In testcross, the organism expressing the dominant phenotype but having an unknown genotype is crossed with a known homozygous recessive individual.

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