Mendel's F2 Ratio & Trait Segregation — NEET Biology
✅ Asked in NEET 2023Mendel then self-pollinated the tall F1 plants and to his surprise found that in the Filial2 generation some of the offspring were 'dwarf'; the character that was not seen in the F1 generation was now expressed. The proportion of plants that were dwarf were 1/4th of the F2 plants while 3/4th of the F2 plants were tall. The tall and dwarf traits were identical to their parental type and did not show any blending, that is all the offspring were either tall or dwarf, none were of in-between height.
NTA tests the 3:1 F2 ratio from monohybrid crosses, where self-pollinating F1 hybrids produce 75% dominant and 25% recessive phenotypes. Students often confuse this with F1 results (100% tall) or assume blending inheritance occurs. The key trap is forgetting that traits don't blend—they remain distinct (tall or dwarf only, never intermediate). Remember: F1 shows dominance only, F2 reveals the recessive trait through a predictable 3:1 ratio, proving segregation of alleles during gamete formation. This fundamental concept explains inheritance patterns and is essential for solving all Mendelian genetics problems.
A cross was made between a tall plant (TT) and a short plant (tt). The F₁ progeny were all tall. If the F₁ plants are self-pollinated, the ratio of tall to short plants in the F₂ generation would be: (NEET 2023)
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.