Question

Test cross in plants or in Drosophila involves crossing:

• A. between two F1 hybrids
• B. between two genotypes with the recessive trait
• C. between two genotypes with the dominant trait
• D. the F1 hybrid with a double recessive genotype

Answer 1

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.