Q. Test cross in plants or in Drosophila involves crossing
A) The F₁ hybrid with a double recessive genotype
B) Between two genotypes with dominant trait
C) Between two genotypes with recessive trait
D) Between two F₁ hybrids
Explanation
[Solution from source] A test cross crosses an organism showing the dominant phenotype, typically the F₁ hybrid, with the recessive parent; for two genes that is the double recessive genotype. Crossing two F₁ hybrids is a selfing or F₂ cross, not a test cross. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.