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ICSE Class 12 Biology — Formula Sheet

ICSE Class 12 Biology formula sheet, chapter by chapter — 22 formulas across 5 chapters. Follows the ICSE / ISC syllabus.

How to Use the Formula Sheet

  1. Write, don't just read — writing each formula out helps it stick.
  2. Understand the derivation — you can rebuild a formula you half-remember.
  3. Group related formulas — link the ones that build on each other.
  4. Test yourself — cover the sheet and write the formulas from memory.

Chapter-Wise Formulas — 5 Chapters

Ploidy of sporophytic phase: (2n)
Ploidy of gametophytic phase: (n)
The full Sexual Reproduction in Flowering Plants formula sheet
Monohybrid F2 Phenotypic Ratio: 3 : 1 [dominant : recessive phenotype]
Monohybrid F2 Genotypic Ratio: 1 : 2 : 1 [homozygous dominant : heterozygous : homozygous recessive]
Dihybrid F2 Phenotypic Ratio: 9 : 3 : 3 : 1 [round yellow : round green : wrinkled yellow : wrinkled green]
Dihybrid F2 Genotypic Ratio: 1 : 2 : 1 : 2 : 4 : 2 : 1 : 1 : 1 : 1 [RRYY : RRYy : rrYY : RrYY : RrYy : rrYy : Rryy : Rryy : RRyy : rryy]
Trihybrid Ratio: 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1 [phenotypic classes for three-gene cross]
The full Principles of Inheritance and Variation formula sheet
A + G = T + C
A = T ; G = C
(A+T)/(G+C) = constant for a species
4^3 = 64
The full Molecular Basis of Inheritance formula sheet

2 more chapters below

Formula sheets for all 5 chapters with formulas.

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Frequently Asked Questions

Where can I find ICSE Class 12 Biology Formula Sheet?

This page has formula sheet for 5 chapters of ICSE Class 12 Biology for the board exams 2027. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Learn the formulas you use most first, and understand what each symbol means so you can apply them. Knowing where a formula comes from helps you rebuild it if you forget it in the exam.

Browse Formula Sheet by Chapter

5 chapters

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