Relating to or denoting a giant chromosome that is composed of many parallel copies of the genetic material, as found in "Drosophila" fruit flies, where they are much used in genetic research.
- ‘It was mapped in Drosophila by polytene chromosome in situ to 3L heterochromatin.’
- ‘The structures of rearrangements were defined by mitotic chromosome staining as well as by genetic and polytene chromosome analysis.’
- ‘Two of those contained repetitive sequence and hybridized to the centromeres of the polytene chromosomes.’
- ‘Anopheline mosquitoes, like Drosophila, are renowned for the presence of polytene chromosomes and chromosomal inversions.’
- ‘Cytogenetic studies of mitotic and polytene chromosomes, allozyme data, and crossing studies indicate that An. dirus A and C are very closely related.’
- ‘This was first recognized more than a half century ago in cytological studies of lampbrush chromosomes in amphibian oocytes and polytene chromosomes in insects.’
1930s: from poly- many + -tene (from Greek tainia band, ribbon) denoting stages of the first meiotic division.
We take a look at several popular, though confusing, punctuation marks.