LIFESCI 1 Lecture 1: Lecture 1
Lecture 1
3/30/15
• Mechanistic questions → proximate questions
• Evolutionary questions → ultimate questions (focus will be on this)
• Evolutionary Trees read according to time (left to right)
• Each line is an ancestral lineage
• Not representative of species but rather taxa
• Each red bar indicates an evolutionary event (optimizing a trait)
• Some electrical fish has specialized brains that allow them to be sensitive to minor
variations in electrical communication
• What is happening at the red arrow? → Clade A has more species. If they have a big
brain region it may allow them to be more selective about what male fish they are
attracted to based off the zap patterns
• What is happening at the blue arrow? →
• Pattern? →
• Evolution of brain trait followed by a pattern
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