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Inheritance and Variation

Maharashtra Board · Class 12 · Biology

Complete topic list for Inheritance and Variation in Maharashtra Board Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

45 questions25 flashcards5 concepts

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4 Topics · Maharashtra Board Class 12 Biology

Topics in Inheritance and Variation

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1. Mendel's Laws and Basic Genetics

  • Gregor Mendel (1822-1884) established the fundamental principles of heredity using garden pea (Pisum sativum)
  • Mendel chose pea plants because: contrasting visible characters, self-pollinating, short life cycle, large number of offspring
  • Seven pairs of contrasting traits studied: seed shape, seed color, pod shape, pod color, flower color, flower position, plant height
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2. Mendel's Three Laws

  • Law of Dominance: In heterozygous condition, only dominant allele expresses; recessive allele remains hidden
  • Law of Segregation (Purity of Gametes): Allele pairs separate during gamete formation; each gamete carries only one allele
  • Law of Independent Assortment: Different trait pairs assort independently during gamete formation
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3. Deviations from Mendelian Inheritance

  • Incomplete Dominance: Neither allele completely dominates; F1 shows intermediate phenotype
  • Co-dominance: Both alleles express simultaneously in heterozygous condition
  • Multiple Alleles: More than two alternative forms of a gene exist in population
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4. Chromosomal Theory of Inheritance

  • Proposed by Sutton and Boveri (1903) - chromosomes are carriers of genetic material
  • Genes are located on chromosomes at specific positions called loci
  • Homologous chromosomes carry alleles for same traits at corresponding loci

Key Concepts

Three fundamental lawsEssential terms includeMonohybrid cross involves one trait (eNonProposed by Sutton and Boveri

Frequently Asked Questions

What are the important topics in Inheritance and Variation for Maharashtra Board Class 12 Biology?
Inheritance and Variation covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Inheritance and Variation — Maharashtra Board Class 12 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

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

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