Download Vestigial Organs

Vestigial Organs
What Is A Vestigial Organ?
It is an organ that was thought
to be useful in an organism at
one time but which no longer
has a known use in that
organism..
Vestigial Organs
Darwin said, “…it is quite
possible for natural selection
gradually to fit a being to a
situation in which several
organs would be superfluous or
useless,”
Charles Darwin, The Origin of Species by Charles Darwin.
1993 Modern Library Edition by Random House, Inc., New
York. P. 161.
Think Critically
* If an organ becomes useless
has the information content in
the DNA increased or
decreased?
* Has the Organism Complexity
Increased or Decreased?
* What kind of evolution is
indicated by vestigial organs?
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