Prepared by Mr. D. Rajamani, M. Sc. ,M. Ed. , P. G. Asst Botany A. C. S Mat. Hr Sec. School, Arni. Tiruvannamalai Dist & www. Padasalai. Net
Waldeyer
Bridges
Balbiani
Flemming
Bridges
Waldeyer
Balbiani
Flemming
7:1:1:7
1:7:7:1
1:1:1:1
9:3:3:1
Pachytene
Leptotene
Zygotene
Diplotene
Oenothera lamarckiana
Sorghum
Neurospora
Cicer gigas
Neurospora
Sorghum
Cicer arietinum
Cicer gigas
2n – 2
2n – 1
2n + 1
2n + 2
Four chromosomes
Three chromosomes
Seven chromosomes
Eight chromosomes
Watson and Crick
O.T. Avery et al
Griffith
Stinberg
20 Å
18 Å
34 Å
35 Å
DNA viruses
TMV
Bacteria
Algae
3 - 5%
10 - 20%
5 - 10%
20 - 30%
70
200
300
400
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