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@REPLYADDR Bob Casanova <nospam@buzz.off>
@REPLYTO 2:5075/128 Bob Casanova
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On Sat, 30 Sep 2023 06:28:29 -0500, the following appeared
in talk.origins, posted by RonO <
rokimoto@cox.net>:
>
https://elifesciences.org/articles/76911
>
>An article from last year has come up in the Science news about hair in
>mammals. Reptiles have scutes and scales, birds have feathers and
>scutes, and mammals have hair. This paper looked at how hair has
>evolved among mammals. They looked at the conserved non-coding
>sequences (usually regulatory) and over 19,000 genes and analyzed them
>to identify the sequences that showed differential rates of evolution
>among the 62 taxa included in the study. They found that genes involved
>in the physical structure of the hair had more rapid evolution in the
>coding sequence of the genes that would affect the structure of the
>hair, but the rate of change for their regulation was the same as for
>most other genes. The genes involved in the regulation of making hair
>showed the opposite. The coding sequence of these regulatory genes
>evolved at the same rate as most of the other genes in the genome, but
>their regulatory sequences had an elevated rate of evolution. This
>makes sense because when you look at mammals there is mostly a shift in
>how the production of hair is regulated to make major changes between
>species. Humans have the same number of hair folicles as a chimp, but
>most of the hairs are too small to be noticeable.
>
>One conclusion from the research is that humans retain all the genes
>that our ancestors had for making hair, but how that hair production is
>regulated has changed in the human lineage to produce something that
>looks like a relatively hairless primate.
>
Interesting; thanks. It sounds to me like "hair is basically
hair, but how that hair grows varies significantly between
species". That about right?
>
--
Bob C.
"The most exciting phrase to hear in science,
the one that heralds new discoveries, is not
`Eureka!` but `That`s funny...`"
- Isaac Asimov
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