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Revision Notes

Genetics and Heredity

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Genetics and Heredity — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Heredity and Variation

  • Heredity is the transmission of traits from parents to offspring through genes.
  • Variation refers to differences among individuals of the same species, even within the same family.
  • Variations arise due to mutations, segregation of chromosomes, and recombination of genes during meiosis.
2

Mendel's Experiments and Laws of Inheritance

  • Mendel used garden pea (Pisum sativum) for his experiments due to its clear contrasting traits and ease of cross-pollination.
  • He studied seven pairs of contrasting traits such as tall vs dwarf, round vs wrinkled seeds.
  • Monohybrid cross involves one pair of contrasting traits; dihybrid cross involves two pairs.
3

Mendel's Laws of Inheritance

  • Law of Dominance: In a heterozygous condition, only the dominant allele expresses itself.
  • Law of Segregation: During gamete formation, alleles separate so each gamete gets one allele.
  • Law of Independent Assortment: Genes for different traits assort independently during gamete formation.
4

Deviations from Mendel's Laws

  • Incomplete dominance: Neither allele is completely dominant; hybrid shows intermediate trait (e.g., pink flowers in Mirabilis).
  • Codominance: Both alleles express fully in heterozygote (e.g., AB blood group, roan coat in cattle).
  • Multiple alleles: A gene has more than two forms (e.g., IA, IB, i for blood groups).

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Full Notes

Key Concepts

Heredity is the transmission of traitsMendel proposed three lawsIncomplete dominance occurs when the heterozygousSome traits are controlled by moreThis theory states that genes

Frequently Asked Questions

What are the important topics in Genetics and Heredity for Telangana Open School (TOSS) Class 12 Biology?
Genetics and Heredity covers several key topics that are frequently asked in Telangana Open School (TOSS) 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 Genetics and Heredity — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 50 practice questions available for this chapter. Revise formulas and 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.

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