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  • Butterfly reported to have 558 chromosomes (and it's not a polyploid)

    From Ernest Major@{$to$}@meden.demon.co.uk to talk-origins on Wed Sep 17 12:27:15 2025
    From Newsgroup: talk.origins

    https://www.cell.com/current-biology/fulltext/S0960-9822(25)01098-X
    --
    alias Ernest Major

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  • From RonO@rokimoto557@gmail.com to talk-origins on Wed Sep 17 07:15:59 2025
    From Newsgroup: talk.origins

    On 9/17/2025 6:27 AM, Ernest Major wrote:
    https://www.cell.com/current-biology/fulltext/S0960-9822(25)01098-X

    It isn't highly polyploid it only has 4 sex chromosomes. Instead they
    claim that the high number of chromosomes is due to chromosomal fission.
    My guess is that a centromere sequence somehow became associated with
    a transposon or retrovirus and caused the fissions due to creating
    multiple centromeres on each chromosome. There had to be some mechanism
    to heal the broken ends with functional telomeres.

    Ron Okimoto

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  • From Ernest Major@{$to$}@meden.demon.co.uk to talk-origins on Wed Sep 17 13:44:01 2025
    From Newsgroup: talk.origins

    On 17/09/2025 13:15, RonO wrote:
    On 9/17/2025 6:27 AM, Ernest Major wrote:
    https://www.cell.com/current-biology/fulltext/S0960-9822(25)01098-X

    It isn't highly polyploid it only has 4 sex chromosomes.-a Instead they claim that the high number of chromosomes is due to chromosomal fission.
    -aMy guess is that a centromere sequence somehow became associated with
    a transposon or retrovirus and caused the fissions due to creating
    multiple centromeres on each chromosome.-a There had to be some mechanism
    to heal the broken ends with functional telomeres.

    Ron Okimoto

    The nearest to this I've heard of is the plant genus Carex with diffuse centromeres and labile karyotypes. But chromosome number there may top
    out at 112, and that one may well be a tetraploid.
    --
    alias Ernest Major

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