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Revision Notes

Heredity — Revision Notes

NIOS · Class 10 · Science & Tech

Heredity revision notes for NIOS Class 10 Science & Tech: 4 topics in quick points. Part of the NIOS Class 10 Science & Tech syllabus.

45 questions44 flashcards3 formulas & key relations5 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

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1. Heredity, Variation, and Genetics

  • Heredity means the passing down of characters from parents to offspring.
  • Heredity is controlled by genes.
  • Variation means differences among individuals of the same kind.
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2. Mendel and Laws of Inheritance

  • Gregor Johann Mendel was an Austrian monk who lived from 1822 to 1884.
  • He grew pea plants and studied inheritance carefully.
  • He postulated laws of inheritance and is known as the founder of genetics.
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3. Chromosomes, Genes, and DNA

  • The nucleus of every cell except mammalian RBCs contains a fixed number of chromosomes.
  • Chromosomes occur in pairs, one from the father and one from the mother.
  • The paired number of chromosomes is called the diploid number and is written as 2n.
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4. DNA Replication

  • Before cell division, DNA duplicates so that each daughter cell gets identical genetic material.
  • The double-stranded DNA molecule unwinds with the help of enzymes.
  • DNA polymerase helps form a new complementary strand.

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Full Notes

Key Concepts

Heredity is the passing downVariation means differences among individualsGenetics is the science of heredityMendel showed that every featureChromosomes are present in the nucleus

Frequently Asked Questions

What are the important topics in Heredity for NIOS Class 10 Science & Tech?
Key topics in Heredity include Heredity, Variation, and Genetics, Mendel and Laws of Inheritance, Chromosomes, Genes, and DNA, DNA Replication. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Heredity for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Heredity. Revise 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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