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Question

Test cross in plants or in Drosophila involves crossing:


A

between two F1 hybrids

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B

between two genotypes with the recessive trait

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C

between two genotypes with the dominant trait

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D

the F1 hybrid with a double recessive genotype

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Solution

The correct option is D

the F1 hybrid with a double recessive genotype


The correct option is D

Explanation of the correct option:

  1. Crossing a plant having a dominant characteristic with a homozygous recessive genotype is known as a test cross.
  2. The test cross can be used to identify the genotype of F1 hybrids displaying dominant traits.

Explanation of the incorrect option:

Option A:

Test cross does not occur between two F1 hybrids.

Option B:

A cross between two recessive genotypes is not a test cross. Hence this option is incorrect.

Option C:

A cross between dominant characteristics with a homozygous recessive genotype is known as a test cross. Hence this option is incorrect.

Final answer: Test cross in plants or in Drosophila involves crossing the F1 hybrid with a double recessive genotype.


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