Monday, March 8, 2010

Platypus - the evidence for macro-evolution


The platypus is an Australian semi-aquatic duck-billed, furry mammal that lay eggs. Interesting? Wait and I thought mammals don't lay eggs??


Answer - Evolution.

The platypus IS A MAMMAL because it produces milk, feeds the young with milk, has hair, is warm-blooded.


But the interesting thing is the platypus lays eggs!

Why?

Because evidence show that mammals descended from reptiles (which lay eggs), and the platypus has retained this reptilian egg-laying characteristic from our reptilian ancestors. Egg laying is a primitive reproduction method passed down from mammal-like reptiles 300 million years ago.

The platypus split from other mammals at least 166 million years ago.

This early split means the platypus genes carry important information from a transitional point on the evolutionary line leading from reptiles to mammals and it retains some characteristics from its reptilian ancestors.


Platypus. The real life evidence for macro-evolution. Reptiles to mammals.


"The platypus genome, like the animal itself, is an amazing amalgam of reptile-like and mammal-like features," said project co-leader Jennifer Graves, of the Australian National University in Canberra.

4 comments:

  1. Another thing that makes a platypus a mammal is that it has three middle ear bones.

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  2. Amy is right!
    http://en.wikipedia.org/wiki/Evolution_of_mammalian_auditory_ossicles

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  3. Platypus also have sexual chromossomes more similar to birds than reptiles or mammals: http://www.macroevolution.net/bird-mammal-hybrids.html

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