Assertion :Cross of F $_{1}$ individual with a recessive homozygous parent is test cross. Reason: No recessive individual are obtained in the monohybrid test cross.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
A test cross is performed to determine the genotype of a dominant parent if it is a heterozygous- or homozygous-dominant. For the purpose, a dominant parent is crossed with a homozygous recessive parent. Since the dominant parent can be either heterozygous (as $F_{1}$ progeny) or homozygous ( $P_{1}$ generation). A monohybrid test cross (Tt x tt or TT x tt) obtains recessive and dominant progeny in 1:1 ratio if the dominant parent is heterozygous (Tt). Thus, the correct answer is option C.

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