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Revision Notes

Heredity

NIOS · Class 10 · Science & Tech

Quick revision notes for Heredity — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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An illustration defining heredity as the passing of traits from parents to offspring and variation as the differences among individuals of the same species, using examples like family resemblance and
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Key Topics to Revise

1

Introduction to Heredity and Variation

  • Heredity is the passing down of characters from parents to offspring
  • Variation refers to differences between individuals of the same species
  • Heredity is controlled by genes - units of inheritance
2

Mendel's Laws of Inheritance

  • Gregor Johann Mendel (1822-1884) - Father of Genetics
  • Conducted experiments on pea plants for 7 years
  • First Law (Law of Segregation): Each trait is controlled by a pair of factors (genes)
3

Chromosomes and Genes

  • Chromosomes are thread-like structures in the nucleus containing genes
  • Human cells have 46 chromosomes (23 pairs) - diploid number (2n = 46)
  • Chromosomes exist in pairs - one from each parent (homologous pairs)
4

DNA Structure and Replication

  • DNA (Deoxyribonucleic Acid) is the genetic material
  • DNA is a polynucleotide made of nucleotides
  • Each nucleotide has: nitrogenous base, deoxyribose sugar, phosphate group

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Full Notes

Key Concepts

Heredity is the passing downGregor Mendel establishedChromosomes are threadDNA is a double helix madeHuman blood groups (A

Frequently Asked Questions

What are the important topics in Heredity for NIOS Class 10 Science & Tech?
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How to score full marks in Heredity — NIOS Class 10 Science & Tech?
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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