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Basic Principles of Inheritance — Revision Notes

CBSE · Class 11 · Biotechnology

Basic Principles of Inheritance revision notes for CBSE Class 11 Biotechnology: 4 topics in quick points. Part of the CBSE Class 11 Biotechnology syllabus.

59 questions76 flashcards5 concepts

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Key Topics to Revise

1

1. Introduction to Heredity and Mendel's Work

  • Heredity is the transmission of characters from one generation to the next.
  • Genes are the inherited units present on chromosomes.
  • Variations are the differences between offspring and their parents.
2

2. Monohybrid Cross, Ratios, and Mendel's Laws

  • A monohybrid cross involves only one pair of contrasting traits.
  • In a tall x dwarf pea cross, all F1 plants are tall.
  • F1 tall plants are heterozygous with genotype Tt.
3

3. Incomplete Dominance, Codominance, and Dihybrid Cross

  • Incomplete dominance occurs when the F1 hybrid shows an intermediate phenotype.
  • Mirabilis jalapa shows incomplete dominance: RR red x rr white gives Rr pink.
  • In the F2 of Mirabilis jalapa, the ratio is 1 red : 2 pink : 1 white.
4

4. Linkage, Crossing Over, and Recombination

  • Linkage is the inheritance of genes together and their retention of parental combination in offspring.
  • Genes on the same chromosome form a linkage group.
  • Bateson and Punnett provided evidence for linkage in sweet pea.

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Full Notes

Key Concepts

Heredity is the transmission of charactersGregor Johann MendelA monohybrid cross considers one pairA test cross is usedIncomplete dominance occurs when the heterozygote

Frequently Asked Questions

What are the important topics in Basic Principles of Inheritance for CBSE Class 11 Biotechnology?
Key topics in Basic Principles of Inheritance include Introduction to Heredity and Mendel's Work, Monohybrid Cross, Ratios, and Mendel's Laws, Incomplete Dominance, Codominance, and Dihybrid Cross, Linkage, Crossing Over, and Recombination. Study these first, then practise questions on each for Class 11 exams.
How should I revise Basic Principles of Inheritance for Class 11 exams?
Learn the core ideas first, then work through the 59 practice questions on Basic Principles of Inheritance. 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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