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Genetic Disorder — Chapter Summary

CBSE · Class 11 · Biotechnology

Summary of Genetic Disorder for CBSE Class 11 Biotechnology. Part of the CBSE Class 11 Biotechnology syllabus.

74 questions80 flashcards4 formulas & key relations5 concepts

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Overview

Genetic disorders arise from changes in chromosomes or genes. Some disorders are caused by changes in chromosome number, some by changes in chromosome structure, and others by mutations in one gene or several genes together. These disorders may be inherited or may arise because of meiotic errors. Th

Key Concepts

Chromosomal disorders are of two main

Chromosomal disorders are of two main types. Structural abnormalities involve changes in chromosome structure such as deletion, duplication, inversion

Monosomy and trisomy are both forms

Monosomy and trisomy are both forms of aneuploidy. Aneuploidy means the gain or loss of one or a few chromosomes. Polyploidy means multiplication of t

Down syndrome is caused by trisomy

Down syndrome is caused by trisomy 21 due to non-disjunction. The karyotype is 47,XX,+21 in females and 47,XY,+21 in males. It occurs in about 1 per 8

Klinefelter syndrome affects males and has

Klinefelter syndrome affects males and has genotype 47,XXY. The extra X chromosome comes from meiotic non-disjunction. It occurs in about 1 out of 100

Turner syndrome affects females and has

Turner syndrome affects females and has karyotype 45,X, also called monosomy X. It occurs in about 1 in 2,500 newborn girls and is often seen in misca

Learning Objectives

  • Understand the difference between structural and numerical chromosomal abnormalities.
  • Recognize aneuploidy and polyploidy with correct examples.
  • Identify the main features of Down syndrome, Klinefelter syndrome, and Turner syndrome.
  • Explain monogenic disorders and their inheritance patterns.
  • Distinguish autosomal recessive, autosomal dominant, X-linked recessive, and X-linked dominant disorders.

Frequently Asked Questions

What are the important topics in Genetic Disorder for CBSE Class 11 Biotechnology?
Key topics in Genetic Disorder include Chromosomal Abnormalities and Syndromes, Structural Chromosomal Abnormalities, Down's Syndrome, Klinefelter's Syndrome. Study these first, then practise questions on each for Class 11 exams.
How should I revise Genetic Disorder for Class 11 exams?
Learn the core ideas first, then work through the 74 practice questions on Genetic Disorder. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Genetic Disorder

All CBSE Class 11 Biotechnology Chapter Summary

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