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THE EVOLUTION OF THE PANDA THUMB

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lihlu fuentes

on 5 November 2013

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Transcript of THE EVOLUTION OF THE PANDA THUMB

THE EVOLUTION OF THE PANDA THUMB
LOOK CLOSELY AT THE PICTURE ABOVE ^
GENERAL DEFINITIONS :
BACKGROUND!!!
Giant pandas or A. melanoleuca are native to asia. They are of the carnivora family, the one bears are in. As stated in ATHRO.COM, A. melanoleuca is part of a group of mammals that are carnivores/ omnivores. The A. melanoleuca's diet though consists mostly of.....(guess!)
ATHRO.COM/THUMBEVOLUTIONJPEG
WORLDWILDLIFE.ORG/PANDABEAR
How many CLAWS can you see?
[1] [2] [3] [4] [5]
All giant pandas, or Ailuropoda melanoleuca, have a total of 5 digits/claws, and are naturally found in asia. Easy right? Nothing new or hard about that... the part that most people don't know, is that A. melanoleuca also have a thumb. Just like humans!!
If you chose
5 you are observative!!!
To be able to understand the rest of the presentation, you should understand what the following words mean
BIOLOGICAL EVOLUTION

NATURAL SELECTION

BIOLOGICAL FITNESS
BIOLOGICAL EVOLUTION
SIMPLIFIED DEFINITION:
A gradual process where one organism and its population, pick up traits that help it survive and reproduce.

NATURAL SELECTION
SIMPLIFIED DEFINITION:
When one organism is born with a genetic mutation that allows it to survive and reproduce. (Main cause of evolution)
BIOLOGICAL FITNESS
SIMPLIFIED DEFINITION:

SURVIVAL OF THE FITTEST!!
NOW FOR THE FUN STUFF
[A] FISH
[B] HUMANS
[C] BAMBOO
WIKIPEDIA.COM/SALMON
WIKIMEDIAA.COM/ROBERT.DOWNEY.JR
KEEPTHEEARTHCLEAN.ORG>
BAMBOO
IS CORRECT!!
THOUGH THESE A. MELANOLEUCA ARE OMNIVORES, THEY LOVE BAMBOO. NOW IF YOU'VE SEEN BAMBOO, IT'S PRETTY TALL, SO HOW DO THE PANDAS GET THIS YOU ASK?......
Giant pandas have a thumb pad on the hand. The panda can press this pad against the pad of its palm. This thumb pad is used by the panda to grasp bamboo shoots. It uses its thumb to hold and manipulate the bamboo while eating.

But, this thumb pad doesn't look like the rest of the fingers as you can see
A. melanoleuca HAVE THUMBS
athro.com/giantpanda
athro.com/giantpanda
If we compare the hand of the Giant Panda to bears, we see that the panda's "thumb" is in the same place as a tiny bone known as the radial sesamoid. These bones are strange little bones that form in the bits of connective tissue that cross joints. Connective tissues (tendons and things) tear easily when they are bent around a corner. Bones don't tear. A bone added to a tendon where it bends around a joint will thus reduce the chance of a small tear (a sprain) expanding and ripping the entire tendon in two. Plus these panda thumbs come in handy.
What is this thumb?
Brown bears hand compared to A. melanoleuca
athro.com/evo/pandathumb
The panda's "thumb" is an enlarged sesamoid bone. This isn't really a true thumb, so it can't move much. It's basically a bony support for the pad above it that the panda's true thumb and fingers can squeeze against to hold bamboo
atrho.com/evo/pandathumb.
pandasinternational.org
^evolution.berkeley.edu/evolibrary >
HAVE YOU EVER...
Have you ever had the need to pick something up off the floor?
Have you ever seen those pick up claws they sell at your local H-E-B/ Wallmart?
Now when you see your item on the floor, have you wished you had one of those pinchy claws attatched to you so you can pick up the item?!
The panda thumb is alot like this... it is a practically immobile bone that is used for the sole purpose, of more efficient feeding!
HOW THIS RELATES TO COYNE'S 6 THEMES OF EVOLUTION
GENETIC VARIATION
COMMON ANCESTRY
CONCLUSION
* All A. Melanoleuca have a thum or pad to help them feed

* This is a clear example of evolution

* Not an ACTUAL functioning thumb.

* Genetic mutation that helped them survive.

* Extension to their hand.
CONGRATULATIONS!YOU NOW KNOW ABOUT THE EVOLUTION OF THE PANDA THUMB
Now we're going to play a little game... there will be questions asked and it is your job to answer them!!!



NOW LETS PLAY EDUCATE THE PANDA!
DOES THE A. MELANOLEUCA HAVE A "REAL" THUMB?
THE PANDA THUMB IS ACTUALLY ONE OF ITS CLAWS, NOT THE PAD
NO!
[1] IMPERFECTION...
[2] COMMON ANCESTRY
[3] NATURAL SELECTION
[4] GENETIC VARIATION

A- 1 & 2
B- 2 & 3
C- 2 & 4
D- 4 & 3
WHAT WERE TWO OF COYNES THEMES OF EVOLUTION THAT RELATE TO THE PANDA THUMB
(USED IN PREZI)
THE ANSWER IS
C!!
WHAT IS THE GIANT PANDAS SCIENTIFIC NAME?
UPLOAD/WIKIMEDIA.ORG/THUM/GIANT/PANDA
Ailuropoda melanoleuca!!!
BLOG.PANFU.COM/SCIENCE-PADA.PGN
DID YOU ENJOY THIS PRESENTATION?
[A] YEAH!
[B] I WANT A PANDA THUMB
[C] BIOLOGY IS FUN
[D] NO COMMENT
YOU'RE ALL CORRECT!!!
AND THAT HAS BEEN A WONDERFUL PRESENTATION ON THE PANDA THUMB
4.BP.BLOGSPOT.COM/MOREYKNOWJPEG
The A. Melanoleuca's thumb is basically a genetic variation (genetic mutation) that gives this A Melanoleuca the advantage to stay alive

Natural selection!!!
http://www.ideacenter.org/surprised-panda-baby
biologos.or/statistics/evolutin_panda
cdn.bionew.org
Like Coyne said "we should be able to find examples of species that link together major groups suspected to have common ancestry, like birds and reptiles." (Why evolution is tru pg.18)
The first A. Melanoleuca probably didn't have this bone like grizzlybears, but havegained this bone over the years.
When people think of a thumb, they usually think of a human thumb. But other animals have a thumb too, animals like koalas, chimps, monkeys and even pandas!!!
koalaland.com
hellofelix.com
media.npr.org
bilogy.umn.ancetry.jpeg
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