NCERT · Class 10 · Science · HeredityIn a monohybrid cross between heterozygous tall (Tt) pea plants, what is the phenotypic ratio of the offspring?
Step-by-Step Solution
Answer: The phenotypic ratio is 3 tall : 1 dwarf. In a Tt × Tt cross, the genotypic ratio is 1 TT : 2 Tt : 1 tt, and since both TT and Tt show the tall phenotype, three out of four plants are tall and one is dwarf.
Explanation:
- TT → Tall
- Tt → Tall
- tt → Dwarf Thus, the phenotypic ratio = 3 tall : 1 dwarf.
Detailed Options Breakdown
Option : 1 tall : 1 dwarf
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.
Option 1: 3 tall : 1 dwarf (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 2: 9 tall : 3 dwarf
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.
Option 3: 2 tall : 2 dwarf
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.
💡 Study Guide: This question tests core syllabus concepts from Heredity. For formulas, key summaries, and mock exam reference guides, read the full Heredity Revision Notes.