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Lesson 2: Biological Evidence

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Lindsey Geissler

on 4 December 2013

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Transcript of Lesson 2: Biological Evidence

Lesson 2: Biological Evidence
Comparative Anatomy
Comparative Anatomy is the study of similarities and differences in the physical structures of organisms.
Besides fossils, comparative anatomy supports the theory of evolution by natural selection.
At some point in our past, humans, frogs, bats, birds, and cats all shared a common ancestor.
Homologous Structures
Parts of organisms that are similar in origin and structure are called homologous structures.
This happens due to evolution
Can indicate how closely two or more species share common ancestors
Analogous Structures
Analogous structures appear similar, but have different ancestral orgins.
The wings of birds and insects are examples
Result from similar environmental conditions that produced similar natural selection outcomes
The science of of the development of embryos from fertilization to birth is embryology.
The more closely related species are, the more features they share during development.
Shared similarities are best explained by the theory of common ancestors and evolution through natural selection.
Molecular Biology
Data from molecular biology support the theory of evolution through natural selection
The proteins of all organisms consist of countless arrangements of just twenty different amino acids
Slight differences in cytochrome c of organisms probably did not develop independently from different ancestral lines.
Pg. 255 in your book has a picture
Vestigial Structures
Another sources of evidence for evolution is vestigial structures - structures that have no function in their present-day form.
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