BIOA01H3 Lecture Notes - Lecture 9: Meiosis, Elephant Bird, Hybrid Zone

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

It can only be applied to populations that overlap geographically. The separation and divergence of populations in allopatry or sympatry. Allopatric speciation: happens when the populations are separate from each other. Sympatric speciation: occurs when the populations are in the same place. Birds: gondwana was the original home of the ratites in 150 mya, it was known as the supercontinent . It began to break up into separate continents in 140 mya: ratites speciated as the continents moved apart in 20 mya. Sympatric speciation example: hawthorn trees are native to north america, the larvae of the hawthorn maggot fly, rhagoletis pomonella, eat the fruit, however, female parasitoids lay their eggs on the fly maggots. Hawthorns: they are native to the north american shrubs in the genus crataegus, hawthorn fruits range from between 5 mm to 20 mm in diameter, with an average of 12. 6 mm.