Chromosomal Theory of Inheritance | Sutton & Boveri | NEET Biology Class 12 | Neela Bakore Tutorials

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Sutton & Boveri — genes are on chromosomes! The physical basis of Mendel’s laws explained.

📌 Topics Covered:
• Sutton’s grasshopper observations (1902)
• Boveri’s sea urchin experiments
• Parallelism: chromosomes ↔ Mendel’s laws
• Morgan’s sex-linked inheritance as experimental proof
• Significance for modern genetics
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Transcript with Timestamp
0:00 Introduction — Chromosomal Theory of Inheritance
0:49 Timeline: 1865 Mendel published → ignored; 1900 rediscovered; 1902 Sutton & Boveri
1:48 Why Mendel’s work was unrecognised — 3 reasons
2:20 By 1902: microscopes available; chromosome structure understood
2:29 Sutton & Boveri re-interpreted Mendel in terms of chromosomes
2:58 Comparison 1 — Mendel: genes (factors) in pairs → Sutton/Boveri: genes on
chromosomes (homologous pairs)
4:12 Comparison 2 — Mendel: alleles segregate at gamete formation → S/B: chromosomes
separate during meiosis
5:34 Comparison 3 — Mendel: independent assortment → S/B: chromosomes assort
independently
7:06 Illustration: chromosome A (with A/a) and chromosome B (with B/b) assort
independently
8:07 Physical evidence = chromosomes gave Mendel’s theory credibility
8:35 Chromosomes CARRY genes from generation to generation = chromosomal theory
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