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Assam Board Class 12 Biology — Formula Sheet

Assam Board Class 12 Biology formula sheet, chapter by chapter — 10 formulas across 3 chapters. Follows the ASSEB / AHSEC 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 — 3 Chapters

4

Principles of Inheritance and Variation

2 entries
(1/2T + 1/2t)^2 = (1/2T + 1/2t) × (1/2T + 1/2t) = 1/4 TT + 1/2Tt + 1/4 tt
(3 Round : 1 Wrinkled) (3 Yellow : 1 Green) = 9 Round, Yellow : 3 Wrinkled, Yellow: 3 Round, Green : 1 Wrinkled, Green
The full Principles of Inheritance and Variation formula sheet
5

Molecular Basis of Inheritance

3 entries
Length of DNA double helix in mammalian cell = 6.6 × 10^9 bp × 0.34 × 10^-9 m/bp ≈ 2.2 metres
E. coli replication rate ≈ 2000 bp/second
E. coli completes replication in about 18 minutes
The full Molecular Basis of Inheritance formula sheet
11

Organisms and Populations

5 entries
N_{t+1} = N_t + [(B + I) - (D + E)]
dN/dt = (b - d) × N
r = b - d
dN/dt = rN
N_t = N_0 e^{rt}
The full Organisms and Populations formula sheet

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Frequently Asked Questions

Where can I find Assam Board Class 12 Biology Formula Sheet?

This page has formula sheet for 3 chapters of Assam Board 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

3 chapters

4

Principles of Inheritance and Variation

5

Molecular Basis of Inheritance

11

Organisms and Populations

More Biology Resources

Assam Board Class 12

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Revision Notes

Key concepts and quick revision points

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Study Plan

Week-by-week preparation schedule

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

NCERT Solutions

Every textbook exercise solved step by step

Other Assam Board Class 12 Subjects

PhysicsChemistryMathematicsAccountancyBusiness StudiesEconomicsHindiGeography