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15.3: Evidence For Evolution
Support for Darwin’s ________________of natural selection.
A _________________ is a hypothesis supported by a large amount of scientific
_________________ from many different observations and experiments.
Comparative Anatomy
______________________________________ is the study of the body structures
(anatomy) of animals of different species.
A. Homologous structures have _________________________mature forms
but develop from the ______________ embryological tissue. (from the
Greek "homos" meaning "same")
In other words, if organisms have homologous structures they share a
The more _____________________ the homologous structure, the more
_________________________they shared a common ancestor.
The "mature" appearances are different for adaptations to different
Zoo of you interactive Head + Body:
B. Vestigial Organs
______________________________ are body structures that no longer
serve the original purpose, but was probably useful to an ancestor
Examples: human appendix, dewclaw in dogs and a whales pelvic bone:
________________________ form when an organism becomes buried in
mud, volcanic ash, or sediments
Fossils from old rock layers were compared with fossils from new rock
Provides a record of early life and evolutionary history.
Record is incomplete. There are "gaps."
__________________________ or "intermediates" can fill the gaps,
providing a continuous picture of evolution.
Bones can be _____________________structures, as in whale evolution.
Fossil record shows how life on Earth has changed over time
 An ______________is the earliest stage of growth and development
 Similarities in embryos suggest a _____________________________.
 Embryological tissues with common cells and growth
patterns develop into __________________________________.
 This is especially true of organisms with backbones.
Guess the embryo:
Biochemical = Amino Acids and DNA
 The more similar the _______and ________________sequences are,
the more closely related organisms are.
 Scientists can determine when species __________________from one
another in evolutionary history through the study of DNA and amino
acid comparisons.
 Of course, Darwin did not use this evidence in his theory! It added
support for the theory later.
 The more biochemistry two species share, the more
________________ they diverged. (The more
_______________________________ they are).
Analogous Structures
 However, animals living under ______________ ecological
conditions on different continents evolve features in common.
These features in common are called ____________________ that
are different in basic structure or form but the same in function.
_______________ indicate a __________________________ (unlike
all the other “evidence” we discussed today).
__________________ provide evidence of evolution by
______________________________in response to environment.
Example: butterfly’s wing, bat’s wing, bird’s wing and pterosaur’s wing