The Naked Scientists

The Naked Scientists Forum

Author Topic: Remains of evolution in humans  (Read 3817 times)

Offline Ricardo Pedri Lopes

  • Jr. Member
  • **
  • Posts: 14
    • View Profile
Remains of evolution in humans
« on: 20/04/2010 12:14:35 »
There are some things that are (I guess) remains of the evolution, as they are not very useful for us, like the toes and the wisdom teeth.

Please post other examples, and the reason for they existing if possible.


 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8124
  • Thanked: 53 times
    • View Profile
Remains of evolution in humans
« Reply #1 on: 20/04/2010 14:13:13 »
http://en.wikipedia.org/wiki/Human_vestigiality

BTW Toes are not vestigial: you won't win the 100 meter sprint without them ...

Quote
Amputation of the great toe or even all five toes usually does not impair walking ability,
 although there may be increased difficulty walking quickly or running due to decreased push-off from the foot.
http://www.mdguidelines.com/amputation-toe
« Last Edit: 20/04/2010 14:26:44 by RD »
 

Offline Jessica H

  • Full Member
  • ***
  • Posts: 73
    • View Profile
    • Growing Southern
Remains of evolution in humans
« Reply #2 on: 20/04/2010 17:26:19 »
Wow, I didn't realize we had vestigal muscles in our ears!
 

Offline Geezer

  • Neilep Level Member
  • ******
  • Posts: 8328
  • "Vive la résistance!"
    • View Profile
Remains of evolution in humans
« Reply #3 on: 20/04/2010 22:57:36 »
Wow, I didn't realize we had vestigal muscles in our ears!

Oh yes. Some people can wiggle their ears quite well. Being a more advanced form of the species, I don't have that ability.
 

Offline JimBob

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 6564
  • Thanked: 7 times
  • Moderator
    • View Profile
Remains of evolution in humans
« Reply #4 on: 21/04/2010 00:47:21 »
Geezer has vestigial nose hair.


We also have a tail hidden inside our body after birth. And while in the womb the human embryo has gills.
 

Offline echochartruse

  • Sr. Member
  • ****
  • Posts: 395
    • View Profile
Remains of evolution in humans
« Reply #5 on: 28/04/2010 06:22:36 »
Wow, I didn't realize we had vestigal muscles in our ears!

Oh yes. Some people can wiggle their ears quite well. Being a more advanced form of the species, I don't have that ability.

is this beneficial to our survival?
 

Offline echochartruse

  • Sr. Member
  • ****
  • Posts: 395
    • View Profile
Remains of evolution in humans
« Reply #6 on: 28/04/2010 06:24:56 »
We also have a tail hidden inside our body after birth. And while in the womb the human embryo has gills.

has this anything to do with the environment we are in?
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8124
  • Thanked: 53 times
    • View Profile
Remains of evolution in humans
« Reply #7 on: 28/04/2010 10:47:03 »
We also have a tail hidden inside our body after birth. And while in the womb the human embryo has gills.

has this anything to do with the environment we are in?

They are vestiges of features which were useful to our our ancestors in the environment they were in, (aquatic, arboreal).
« Last Edit: 28/04/2010 10:54:19 by RD »
 

Offline echochartruse

  • Sr. Member
  • ****
  • Posts: 395
    • View Profile
Remains of evolution in humans
« Reply #8 on: 30/04/2010 00:17:21 »
We used to think that our appendix was one, now we understand the use of it more clearly. To help grow back the good bacteria in our digestive system.

pharyngeal arches are not gills, do not function as gills but pharyngeal arches have a function. http://isc.temple.edu/marino/embryology/parch98/parchdev.htm
http://www.embryology.ch/anglais/sdigestive/gesicht07.html#defpharynx34

 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8124
  • Thanked: 53 times
    • View Profile
Remains of evolution in humans
« Reply #9 on: 05/05/2010 11:48:10 »
Vestigial structures are not necessarily useless...

Quote
Although structures usually called "vestigial" are largely or entirely functionless, a vestigial structure may retain lesser functions or develop minor new ones
http://en.wikipedia.org/wiki/Vestigial


Whether or not vestigial structures have some function they are evidence evolution has occurred.
 

Offline echochartruse

  • Sr. Member
  • ****
  • Posts: 395
    • View Profile
Remains of evolution in humans
« Reply #10 on: 06/05/2010 23:55:36 »
Evolution Of The Human Appendix: A Biological 'Remnant' No More
http://www.sciencedaily.com/releases/2009/08/090820175901.htm

pharyngeal arches have a major function in our embryotic development not minor.

Darwin included mens nipples
Quote from: http://menshealth.about.com/od/conditions/a/Nipples_Men.htm
As embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!

Darwin mentioned eye lashes, but we  know why we have them.

Since we have evolved from chimps and our DNA is 94% the same can you tell me what vestigial structures, if any are evidence from our recent evolution?


« Last Edit: 07/05/2010 00:38:49 by echochartruse »
 

The Naked Scientists Forum

Remains of evolution in humans
« Reply #10 on: 06/05/2010 23:55:36 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums