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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 12:22:27 -0500, the following appeared
in talk.origins, posted by RonO <
rokimoto@cox.net>:
>On 9/30/2023 10:55 AM, Bob Casanova wrote:
>> 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?
>>>
>
>Hair can change structurally like curly hair or straight are changes in
>the structural properties, but how thin or thick, how long it grows and
>how much grows seems to be regulatory. We obviously retain the
>structural genes to grow hair, but those genes are regulated differently
>to produce what we are.
>
OK; thanks. That`s pretty much what I thought.
>
--
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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