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What is it? What evidence is there to support it?. Evolution. Think about it. Earth has millions of different kinds of organisms of every imaginable shape, size, and habitat. The variety of living things is called ________________. How did all these different organisms arise? - PowerPoint PPT Presentation
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EVOLUTION
What is it? What evidence is there to support it?
Think about itEarth has millions of different kinds of organisms of every imaginable shape, size, and habitat.
The variety of living things is called________________. How did all these different
organisms arise? How are they related?
biological diversity
Evolution Explains the diversity of organisms on Earth It is change over time
NO!
Do organisms evolve?
Populations do
What is the evidence for evolution? Paleontology
What is Paleontology?
Study of Fossils Evidence of living things from long ago
Body fossils Trace fossils
Body Fossils
Ammonite Fern
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Trace Fossils
Tracks Coprolites
What is the evidence for evolution? Paleontology Comparative Anatomy and Physiology
Comparative Anatomy and Physiology Vestigial Structures Transitional Species Homologous Structures
Vestigial Structures
Dogs & Dew claws Eye sockets & Blind Cave fish
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Transitional Species
Archaeopteryx Tiktaalik
Are there any extant organisms that have traits of one group of animals and traits from another?
Something to think about…
Yes!
Behold the Platypus!This animal is classified as a mammal however it has many reptilian traits• Lays eggs• Has a bill• Has a poisonous spur• Sensory organs on bill
similar to that of a crocodile
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Homologous Structures
What is the evidence for evolution? Paleontology Comparative Anatomy and Physiology Embryology and Molecular Biology
Embryology Hypothesis:
If animals share a common ancestry then it will be reflected in their development
Developmental Patterns Homeobox (Hox) genes
are responsible for “telling” the embryo to develop certain features; eyes, arms, wings, legs, fins, etc.
Whale and Dolphin Embryo with…
Hind limbs!
Hind Limbs expressed!
What is the evidence for evolution? Paleontology Comparative Anatomy and Physiology Embryology Biogeography
Biogeography
The distribution of similar plants and animals around the planet suggests that their environments drove the evolution of species that are similar
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