Giemsa-stained Drosophila melanogaster mitotic metaphase chromosomes seen with a light microscope. A is male (Y-chr marked), b is female. Chromosomes clockwise from left in both images: autosome pairs 2 and 3 (order unknown), X (& Y). Chromosome pair 4 is in the middle of the radial metaphase plate.
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{{Information |Description=Drosophila melanogaster metaphase chromosomes. A is male (Y-chr marked), b is female |Source=Own work |Date=1.2.2007 |Author=J. Albert Vallunen |Permission= |other_versions= }}