Answer: A known homozygous recessive (aabb...).
- A Another individual of equally unknown genotype
- B A known homozygous dominant individual
- C A known homozygous recessive (aabb...)
- D Another F<sub>1</sub> 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.
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
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 →