Taxacom: 46 chromosomes in Homo species and subspecies

Sun Feb 19 22:06:10 CST 2023

I don't think so Ken. The age estimates are fossil calibrated (and based on
the chimpanzee theory of human origin) so any dates are miniums only. In
this respect my opinion of what is 'likely' would seem to remain just as
valid.

Cheers,

John Grehan

On Sun, Feb 19, 2023 at 9:24 PM Kenneth Kinman via Taxacom <
taxacom at lists.ku.edu> wrote:

> Recently published evidence:
>       I found a recently published article (August 2022) which concludes:
> "By analyzing the enrichment of these substitutions around the fusion site
> of HSA2 we estimated its formation time at 0.9 Mya with a 95% confidence
> interval of 0.4-1.5 Mya."
>        This would indicate the transition from 48 to 46 chromosomes
> probably occurred in either Homo sapiens heidelbergensis or Homo erectus
> (well after Australopithecus gave rise to genus Homo).
>
>
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> ________________________________
> From: John Grehan <calabar.john at gmail.com>
> Sent: Saturday, February 18, 2023 9:35 PM
> To: Kenneth Kinman <kinman at hotmail.com>
> Cc: taxacom at mailman.nhm.ku.edu <taxacom at mailman.nhm.ku.edu>
> Subject: Re: Taxacom: 46 chromosomes in Homo species and subspecies
>
> It seems likely their Australopithecus ancestors had 46 chromosomes
>
> On Sat, Feb 18, 2023 at 9:29 PM Kenneth Kinman via Taxacom <
> taxacom at lists.ku.edu<mailto:taxacom at lists.ku.edu>> wrote:
> Hi all,
>         I was looking at a 2016/2017 paper indicating that at least some
> individuals of Homo sapiens neanderthalensis (neandertals and denisovans)
> possessed just 46 chromosomes.  I guess this doesn't prove that all of them
> had just 46 chromosomes, but it seems likely most or all of them did, and
> that the transition occurred earlier.
>         I am just wondering if there has been any preliminary sequencing
> which indicates the presence of just 46 chromosomes in Homo sapiens
> heidelbergensis, and its presence or absence in Homo erectus or
> floresiensis ("hobbit").  It seems likely their Australopithecus ancestors
> had the ancestral 48 chromosomes, but it would be nice if this could
> eventually be verified.
>                            ------------Ken Kinman
>
>
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