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"genetic bottleneck" in cheetahs past

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Cortney Persson

on 3 October 2012

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Transcript of "genetic bottleneck" in cheetahs past

A "genetic (population) bottleneck" in cheetahs' past When most mammals, humans included, need a skin graft, doctors must use skin from the patient because the body will reject another's unless they are identical twins. Evidence of genetic bottleneck #1: Skin grafts Enzymes are medium-sized proteins which speed up chemical reactions. For example, in your body, enzymes speed up the burning of food for energy. (Allowing you to eat more meals during the day!) Evidence of genetic bottleneck #2: Enzymes http://animals.nationalgeographic.com/animals/mammals/cheetah/?source=A-to-Z http://www.abc.net.au/science/articles/1999/08/02/40791.htm It is believed that tens
of thousands of years ago
the cheetah species under-went a genetic bottleneck
leaving a drastic reduction in numbers, forcing them
to inbreed to
maintain their species.
The inbreeding
causes a genetic
vulnerability that is
a cause of the cheetahs
rapid decline. Cheetahs of at least four different sub-species once roamed through
North America, Asia, Europe and Africa. Recently, the cheetah exists in
sub-Saharan Africa as only one sub-species, Acinonyx jubatus, with a
tiny remnant population barely surviving in northern Iran. http://www.citruscollege.edu/lc/archive/biology/Pages/Chapter15-Rabitoy.aspx Evidence of genetic bottleneck #3: Skulls How do we save these big cats from extinction? The Big Question: http://www.cheetah.org/?nd=genetic_diversity Be knowledgeable (learn more about big cat extinctions)
Donate to causes that have background in helping cheetahs
Volunteer at a local zoo/sanctuary www.cheetah.org Cheetahs are so alike that skin from one cheetah can be used as a skin graft for a whole other cheetah. The only other mammal known to be able to do this is the pocket gopher. http://www.nature.com/nature/journal/v381/n6583/pdf/381566b0.pdf http://bio150.chass.utoronto.ca/labs/cool-links/lab5/OBrien_et_al_1985_lab_5.pdf According to the enzymes, humans rate at about 70% identical; which seems a lot until compared to that of cheetahs who rate at about 97% identical. This rate, of 97%, is identical to that of lab rats who have been inbred for 20 generations. Leading to the conclusion that cheetahs have also been inbreeding for a long time. http://www.abc.net.au/science/articles/1999/08/02/40791.htm http://www.educationalbiofacts.com/educational-skulls-replica-mammalia-carnivora-felidae.html http://www.humansoul.com/Nature_2_0.html Is your skull
symmetrical? A cheetah's skull is asymmetrical. The more inbred an animal is the less symmetrical their skull will be. That means cheetahs, some where along the line, were forced to inbreed to save their species. http://www.abc.net.au/science/articles/1999/08/02/40791.htm A pedigree from an experiment
done by S.J. O'Brien et al. (1985) showing
cheetahs that had undergone a
skin graft from another cheetah The shaded in
areas are the
cheetahs that
received a skin
graft and the
dotted lines
connect the
recipients and
the donors. Each
was given a
skin graft and
each gave a skin
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