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Genetic Basis of Inheritance is the branch of Biology that explains how traits are transmitted from parents to offspring. It forms the foundation of genetics and helps us understand heredity and variation in living organisms.

This chapter is highly important for NEET Biology and frequently appears in conceptual and numerical questions.

What is Inheritance?

Inheritance is the process through which genetic information is passed from one generation to the next through genes.

Mendel and Genetics

Gregor Johann Mendel is known as the Father of Genetics. His experiments on pea plants established the basic principles of inheritance.

Genetic Basis of Inheritance
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Mendel's Laws of Inheritance

Law of Dominance

When two contrasting traits are present together, only one trait is expressed in the offspring.

Law of Segregation

The two alleles of a gene separate during gamete formation and reunite during fertilization.

Law of Independent Assortment

Genes controlling different traits assort independently during gamete formation.

Important Concepts

Genes and Alleles

  • Gene: Unit of heredity that controls a specific trait.
  • Alleles: Alternative forms of the same gene.

Chromosomes

Chromosomes are structures that carry genetic material and are responsible for transmitting hereditary information.

Genotype and Phenotype

  • Genotype: Genetic constitution of an organism.
  • Phenotype: Observable characteristics of an organism.

Inheritance Patterns

Different inheritance patterns include:

  • Monohybrid Cross
  • Dihybrid Cross
  • Incomplete Dominance
  • Codominance
  • Sex-Linked Inheritance

Importance of Genetics

  • Explains hereditary traits.
  • Helps understand genetic disorders.
  • Supports plant and animal breeding.
  • Advances medical research.
  • Contributes to biotechnology.

Importance for NEET

Genetic Basis of Inheritance is a high-weightage chapter in NEET Biology. Questions are frequently asked on Mendel's laws, monohybrid and dihybrid crosses, inheritance patterns, pedigree analysis, and genetic disorders.

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