Mutation & Genetic Disorders | Gene, Chromosomal Mutations & Inherited Diseases | NCERT | NEET 2026

Описание: This lecture covers Mutation and Genetic Disorders from NCERT Class 12 Biology, explained in a simple, conceptual, and exam-oriented manner for NEET 2026 aspirants.
This chapter is extremely important in NEET Biology, and every year 2–3 direct MCQs are asked from:
✔ Types of mutations
✔ Gene mutation
✔ Chromosomal mutation
✔ Numerical abnormalities
✔ Autosomal disorders
✔ Sex-linked disorders
✔ Metabolic disorders
In this lecture, each concept is explained with:
NCERT diagrams
Real-life examples
Memory tricks
PYQ discussion
Exam traps
This video will help you:
✅ Understand mutation mechanisms
✅ Identify different genetic disorders
✅ Memorize disease characteristics
✅ Avoid confusion in MCQs
✅ Score maximum marks in Genetics
After watching this lecture, you will master all NEET questions related to mutation and inherited diseases.
🔬 Topics Covered in This Lecture (NCERT Order)
🔹 1. Introduction to Mutation
Definition: Mutation is a sudden change in genetic material.
Types:
Natural mutation
Induced mutation
📌 NEET Point:
Mutation produces variation.
🔹 2. Gene Mutation
Changes in DNA sequence.
Types:
Point mutation
Frameshift mutation
Example:
Sickle cell anaemia (point mutation)
📌 NEET Favourite:
Sickle cell is caused by base substitution.
🔹 3. Chromosomal Mutation
Structural Changes:
Deletion
Duplication
Inversion
Translocation
Numerical Changes:
Aneuploidy
Polyploidy
📌 NEET Trap:
Down syndrome = Trisomy 21.
🔹 4. Mutagens
Agents causing mutation.
Types:
Physical (UV, X-rays)
Chemical (Mustard gas)
Biological (Virus)
🔹 5. Genetic Disorders
✅ (A) Mendelian Disorders
Single gene disorders.
Examples:
Sickle cell anaemia
Phenylketonuria
Thalassemia
Albinism
📌 NEET Favourite:
Phenylketonuria → absence of phenylalanine hydroxylase.
✅ (B) Chromosomal Disorders
Examples:
Down syndrome (47+21)
Turner syndrome (XO)
Klinefelter syndrome (XXY)
✅ (C) Sex-Linked Disorders
Examples:
Haemophilia
Colour blindness
📌 NEET Favourite:
Haemophilia is X-linked recessive.
🔹 6. Pedigree Analysis
Study of inheritance patterns
Identification of carriers
🔹 7. Diagnosis & Prevention
Amniocentesis
Karyotyping
Genetic counseling
🔹 8. Role of Mutations in Evolution
Source of variation
Natural selection
📊 NCERT Summary Table (High-Yield)
Disorder
Cause
Inheritance
Sickle cell
Point mutation
Autosomal recessive
Down
Trisomy 21
Chromosomal
Haemophilia
X-linked
Recessive
PKU
Enzyme deficiency
Recessive
Turner
XO
Chromosomal
⚠️ NEET Traps Covered
✔ Sickle cell = substitution
✔ Down = trisomy
✔ PKU = enzyme defect
✔ Haemophilia = X-linked
✔ Turner = XO
🎓 Who Should Watch This Lecture?
NEET 2026 & 2027 aspirants
Class 12 students
Droppers
Biology teachers
Medical entrance aspirants
Mutation NEET
Genetic Disorders Biology
Sickle Cell Anaemia
Down Syndrome
Haemophilia
Chromosomal Mutation
NCERT Genetics
NEET 2026 Biology
gene mutation examples
types of mutation biology
genetic disease class 12
neet genetics lecture
pedigree analysis disorder
#Mutation
#GeneticDisorders
#NEET2026
#NEETBiology
#NCERTBiology
#Class12Biology
#Genetics
#SickleCell
#DownSyndrome
#Haemophilia
#OneShotBiology
#ExamOriented