Speciation & Macroevolution. Species. What is a species?. Speciation. Microevolution – Speciation – Macroevolution. Reproductive Isolation. Reproductive isolation – Classified as: - Prezygotic mechanisms – - Postzygotic mechanisms –. 5 Prezygotic Mechanisms.
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What is a species?
- Prezygotic mechanisms –
- Postzygotic mechanisms –
Groundhog – lives in fields at lower elevations
Marmot – lives in alpine meadows
Day and night-blooming cacti
Insects of a particular size and shape can enter the Pink Lady Slipper’s sac to get pollen
Coral reefs release sperm and egg. Those from same species will fuse together
Different species may produce a hybrid –
2. Hybrid inviability –
Mule - infertile
Allopatric Speciation –
Sympatric Speciation –
Frogs live in same habitat – but 1 is diploid, other is tetraploid
What does that indicate about their evolutionary relationship?
Divergent Evolution –
Convergent Evolution –
Why would this occur?
Both theories are widely accepted
Plants require bees to disperse pollen. To attract bees –produce sweet nectar
Monarch caterpillar tolerates milkweed’s toxins and can store it in its tissues to make itself poisonous to others
Any other examples we’ve discussed?