evolutionary processes and...
TRANSCRIPT
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EVOLUTIONARYPROCESSES AND PATTERNS
• Extinction of Species
Vestigial Traits
EVOLUTIONARYPROCESSES AND PATTERNS
• Vestigial Traits
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Convergent Evolution
EVOLUTIONARYPROCESSES AND PATTERNS
• Law of Succession
Tran
sitio
nal f
orm
s
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Common Ancestry
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EVOLUTIONARYPROCESSES AND PATTERNS
• Homology • Analogy
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• Homologies
Not Homology
EVOLUTIONARYPROCESSES AND PATTERNS
• Homologies– Developmental
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Homology
Homology
EVOLUTIONARYPROCESSES AND PATTERNS
• Homologies– Genetic
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Charcot-Marie-Tooth • Named for three physicians who firstidentified it in 1886– Jean-Martin Charcot– Pierre Marie– Howard Henry Tooth
• AKA hereditary motor and sensoryneuropathy (HMSN) or peronealmuscular atrophy
• Part of a group of disorders thataffect peripheral nerves– Lie outside the brain and spinal cord
and supply the muscles and sensoryorgans in the limbs.
– Disorders that affect the peripheralnerves are called peripheralneuropathies.
Homology
Charcot-Marie-ToothHomology
Genetic disease sharedby humans, chimps, andbonobos
Homology
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Homology
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Why enlarge both?
• Story 1
– The radial sesamoid in the handoriginally served to strengthen itstendon.
• It then got bigger to help the pandagrip bamboo.
– The tibial sesamoid in the foot wasenlarged incidentaly
• Bone development in the limbs tendto mimic each other
• Story 2
– The radial and tibial sesamoidsoriginally served to strengthen theirtendons.
– They then enlarged to serve as treeclimbing aids in the ancestors of thegiant panda
– The radial sesamoid was then co-opted to help the panda grip bamboo
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Time Periods
Time Periods