biology

target	495+/500
author	Senior Sibling
name	biology
description	Master framework for CBSE 12th Biology. Genetics to Biotechnology.
stream	pcmb

Biology — CBSE Grade 12 (2026-27)

Syllabus Coverage

Unit	Chapters	Theory Marks	Practical Marks
VI	Reproduction	16	30
VII	Genetics & Evolution	20
VIII	Biology in Human Welfare	12
IX	Biotechnology	12
X	Ecology	10

Chapter-by-Chapter Deep Dive

• Genetics: Mendelian laws, Linkage, DNA structure, Fingerprinting.
• Biotech: PCR, Recombinant DNA, pBR322.
• Reproduction: Double fertilization, Gametogenesis.

High-Yield Topics (490+ Strategy)

• Molecular Basis of Inheritance (DNA Replication/Transcription).
• Biotechnology Principles (Process of Recombinant DNA).
• Human Reproduction (Male/Female systems).

Derivation/Proof Bank

1. Proof of DNA as genetic material (Hershey-Chase).
2. Hardy-Weinberg equilibrium proof.

Formula Bank

• $p^2 + 2pq + q^2 = 1$ (Hardy-Weinberg).

Diagram Bank

• Human Sperm structure.
• Transcription Unit.
• pBR322 Plasmid.
• Polymerase Chain Reaction (PCR).

CBSE Question Patterns (12th specific)

• 1M: Identification of codon.
• 3M: Describing a biotech tool.
• 5M: Long answer on Genetics with crosses.

NEET/JEE Alignment

• NEET: 100% NCERT line-by-line focus is mandatory. High weightage for Genetics and Biotech.

Practical Component

• Experiments: Pollen germination, DNA isolation from plant material (Onion/Spinach).
• Viva: What is the function of the buffer in DNA isolation?

Common Mistakes (12th specific)

• Wrong labelling of diagrams.
• Confusing between Transcription and Translation.

Internal Assessment Strategy (30 marks)

• Neat diagrams in the record book are a must.

Answer Writing for 12th

• Use bullet points. Underline scientific names.