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Lecture

Lecture 23

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Department
Biology
Course
BIO120H1
Professor
James Thomson
Semester
Fall

Description
Lecture 23 Toda’s global environmental problems - Global warming & climate change - Los f biodiversity - Environmental pollution - Human famine - spread f diseases - human population growth Responses to climate change - migrate - adapt - go extinct - Art Weis EEB: o can drought cause rapid contemporary evolution? o Evidence for directional selection for early flowering in both populations in 2002 o Earlier flowering plant set more seed o Collected seeds in 1997 and 2004 o Compare them afterwards in greenhouse o Droughts have imposed selection on the flowering time, therefore, there should be Biodiversity - The number and kinds of living organisms in a givin area - 2 elements o Interspecific variation or species diversity o Intraspecific variation or genetic diversity - Has many components Extinction - Natural but its current rate is not - Permanent elimination of a species – extinction is forever - Extinction is a normal evolutionary process; 99% of all species that have ever lived are now extinct - Studies require a lot of information Three types of extinction can b
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