- A Another individual of equally unknown genotype
- B A known homozygous dominant individual
- C A known homozygous recessive (aabb...)
- D Another F1 hybrid from the same cross
Correct answer: C. A known homozygous recessive (aabb...)
Explanation: Test cross: unknown genotype x homozygous recessive. If offspring ratio is 1:1, the unknown is heterozygous; if all dominant, it is homozygous dominant.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →