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Chromosomal Basis of Inheritance is an important chapter in Class 12 Biology that explains how chromosomes carry genes and transmit hereditary information from one generation to the next. It provides the connection between Mendelian genetics and modern genetics.

This chapter is highly important for NEET and Class 12 Board Exams.

Chromosomes and Genes

Chromosomes are thread-like structures present in the nucleus that contain genetic material. Genes are located on chromosomes and control inherited traits.

Chromosome Theory of Inheritance

The Chromosome Theory of Inheritance was proposed by Sutton and Boveri. It states that genes are carried on chromosomes, which segregate and assort independently during gamete formation.

Chromosomal Basis of Inheritance
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Linkage and Recombination

Linkage

Linkage refers to the tendency of genes located on the same chromosome to be inherited together.

Recombination

Recombination occurs during meiosis when genetic material is exchanged between homologous chromosomes, producing genetic variation.

Sex Determination

Sex determination is the process by which the sex of an individual is established.

Human Sex Determination

In humans:

  • Females possess XX chromosomes.
  • Males possess XY chromosomes.

The male parent determines the sex of the offspring.

Sex-Linked Inheritance

Some traits are controlled by genes located on sex chromosomes.

Common Examples

  • Colour Blindness
  • Haemophilia

These traits show characteristic inheritance patterns across generations.

Importance of Chromosomal Basis of Inheritance

  • Explains transmission of genetic traits.
  • Provides evidence for chromosome theory.
  • Helps understand genetic disorders.
  • Explains variation among organisms.
  • Forms the basis of modern genetics.

Importance for NEET

Chromosomal Basis of Inheritance is a high-weightage chapter in Biology. Questions are frequently asked on chromosome theory, linkage, recombination, sex determination, sex-linked inheritance, and genetic disorders.

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