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EVOLUTION
EVOLUTION:
change of a species over time
• Individuals do not evolve; individuals grow and develop
• Acquired traits are not passed on to offspring
• Natural selection is a process that can lead to evolution
EVOLUTION:
change of a species over time
• Individuals do not evolve
• Acquired traits are not passed on to offspring
• Natural selection is a process that can lead to evolution
- a species evolves a trait only if it provides an increase
in fitness
EVOLUTION:
change of a species over time
• Individuals do not evolve
• Acquired traits are not passed on to offspring
• Natural selection is a process that can lead to evolution
- a species evolves a trait only if it provides an increase
in fitness
- variation continues without a selective force
VESTIGIAL STRUCTURES:
structures that have no function and no longer serve a
purpose to the organism
- “residual” structures
HOMOLOGOUS STRUCTURES:
structures from different organisms that have different
mature forms but develop from the same embryonic tissues
• Provides evidence of
common ancestry
HUMAN FOREARM
CAT LEG
CLADOGRAMS
phylogenetic tree;
a branching diagram
showing the evolutionary
relationships among
organisms
Modern Organisms
Extinct Organisms
gavenche
Common Ancestors
VERTEBRAE = SPINE
MAMMALS
AMNIOTIC EGG
TETRAPOD, LUNGS
JAWS
VERTEBRAE = SPINE