• Background
• References
• X divisions 1-10 / 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• X divisions 11-20 / 11, 12, 13, 14, 15, 16, 17, 18, 19-20
• 2L divisions 21-30 / 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
• 2L divisions 31-40 / 31, 32, 33, 34, 35, 36, 37, 38, 39, 40
• 2R divisions 41-50 / 41, 42, 43, 44, 45, 46, 47, 48, 49, 50
• 2R divisions 51-60 / 51, 52, 53, 54, 55, 56, 57, 58, 59, 60
• 3L divisions 61-70 / 61, 62, 63, 64, 65, 66, 67, 68, 69, 70
• 3L divisions 71-80 / 71, 72, 73, 74, 75, 76, 77, 78, 79-80
• 3R divisions 81-90 / 81-82, 83, 84, 85, 86, 87, 88, 89, 90
• 3R divisions 91-100 / 91, 92, 93, 94, 95, 96, 97, 98, 99, 100
• 4th chromosome divisions 101-102. See also the figures in Chromosoma 111:273-283 (2002).
• Chromocenter / X20, 2L40, 40-41, 2R41, 3L80, 80-81, 3R81, 4: 101-102

Polytene chromosomes (X, 2L, 2R, 3L, 3R, 4) of Drosophila melanogaster consist of 102 divisions according to the standard drawn reference maps of Bridges. Chromosome maps are needed and used when, for example, the position of a gene, the breakpoint in a chromosome rearrangement, or the location of DNA by in situ hybridization, is determined.

Electron micrograph (EM) maps of the polytene salivary gland chromosomes of D. melanogaster have been published piecemeal in 1979-1996 mainly in the journal Hereditas (see the list of references). Hereditas, Springer-Verlag and Georg Thieme Verlag have granted permission to republish these maps on the Internet.

The EM maps can be used as an additional reference to check the locations of subdivision boundaries or the names of individual bands of a chromosome region in real chromosomes instead of in a drawing.

Divisions 1 and 2 of X:

V. Sorsa and A.O. Saura, Hereditas 92: 73-83 (1980)

Divisions 3, 4 and 5 of X:

V. Sorsa and A.O. Saura, Hereditas 92: 341-351 (1980)

Divisions 6 through 10 of X:

V. Sorsa, A.O. Saura and T.I. Heino, Hereditas 98: 181-200 (1983)

Divisions 11 through 20 of X:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 119: 123-141 (1993)

Divisions 21 and 22 of 2L:

A.O. Saura and V. Sorsa, Hereditas 90: 39-49 (1979)

Divisions 23 through 26 of 2L:

A.O. Saura, Hereditas 93: 295-309 (1980)

Divisions 27, 28 and 29 of 2L:

A.O. Saura and V. Sorsa, Hereditas 91: 219-230 (1979)

Divisions 30 and 31 of 2L:

A.O. Saura and V. Sorsa, Hereditas 90: 257-267 (1979)

Divisions 32 through 36 of 2L:

A.O. Saura, Hereditas 99: 89-114 (1983); (includes micrographs of the regions 37-40 of 2L)

Divisions 37, 38 and 39 of 2L:

A.O. Saura and V. Sorsa, Hereditas 91: 5-18 (1979)

Divisions 41 through 50 of 2R:

A.O. Saura, PhD Thesis, University of Helsinki:1-58 (1986)

Divisions 51 through 60 of 2R:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 114: 15-34 (1991)

Divisions 61, 62, and 63 of 3L:

V. Sorsa, A.O. Saura and T.I. Heino, Chromosoma 90: 177-184 (1984)

Divisions 64 through 70 of 3L:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 110: 235-252 (1989)

Divisions 71, 72, and 73 of 3L:

V. Sorsa, A.O. Saura and T.I. Heino, Biol. Zent.bl. 106: 303-314 (1987)

Divisions 74 through 80 of 3L:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 109: 1-13 (1988)

Divisions 81 through 90 of 3R:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 121: 1-20 (1994)

Divisions 91 through 100 of 3R:

A.O. Saura, T.I. Heino and V. Sorsa, Hereditas 124: 71-90 (1996)

Divisions 101 and 102 of 4:

A.O. Saura et al., Chromosoma 111: 273-283 (2002), DOI 10.1007/s00412-002-0209-1

This page has been constructed in 1997.
URL: http://www.helsinki.fi/~saura/EM/index.html
URN:NBN:fi-fe20021365