Heredity and Variation
Maharashtra Board · Class 9 · Science
Quick revision notes for Heredity and Variation — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Inheritance and Heredity
- Genetics is the branch of biology that studies transfer of characteristics from one generation to the next
- Heredity is the transfer of characteristics from parents to offspring
- Organisms produced by asexual reproduction show minor variations
Chromosomes and DNA Structure
- Chromosomes are structures in the nucleus that carry hereditary characteristics
- Made up mainly of DNA and proteins
- Each species has a specific number of chromosomes (humans have 46)
RNA Types and Functions
- RNA contains ribose sugar, phosphate, and four bases (A, G, C, U)
- Three main types: rRNA, mRNA, and tRNA
- rRNA is component of ribosomes for protein synthesis
Mendel's Laws of Inheritance
- Gregor Mendel studied inheritance using pea plants (Pisum sativum)
- Used seven contrasting characteristics like plant height, seed color, seed shape
- Discovered dominant and recessive traits
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