Open AccessElectron microscopic analysis of the banding pattern in the salivary gland chromosomes of Drosophila melanogaster . Divisions 30 and 31 of 2L *
Author(s) -
SAURA ANJA O.,
SORSA VEIKKO
Publication year - 1979
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1979.tb01313.x
Subject(s) - biology , drosophila melanogaster , electron microscope , salivary gland , chromosome , anatomy , melanogaster , drosophila (subgenus) , evolutionary biology , optics , physics , genetics , biochemistry , gene
The electron microscope reveals at least 79 recognizable bands in the middle divisions ( 30 and 31 ) of the salivary gland chromosome 2L of Drosophila melanogaster . This number of bands is about 4% less than given (82) in the revised light microscopic map of P. N. BRIDGES, and about 5% more than drawn by C. B. BRIDGES (75) in his original LM map for these divisions. The main differences between the banding patterns in the electron microscopic and the revised Light microscopic maps are as follows: many LM doublets are singlets in EM, a few LM singlets can not be seen in EM, but. on the contrary, there are some new bands visible with EM only. The number of doublets in the revised LM maps seems to be based on an unsatisfactory criterion of double bands. An EM doublet is probably best defined as consisting of two adjacent bands with contact zones.