1 Bio1B Evolution 11 Last lecture: Species & speciation • Hybridization - hybrid zones, reinforcement & hybrid-speciation Today MACROEVOLUTION • The fossil record & background extinction • Mass extinctions - the Cretaceous/Paleogene (“K/T”) boundary - cause & consequence Transitional forms • Terrestrial vertebrates (tetrapods) • Birds & evolution of feathers Evolution of development programs [Text Pp. 525-530] • The eye, vertebrate limbs
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Bio1B Evolution 11 - Integrative Biologyib.berkeley.edu/courses/bio1b/evolutionspring11/pdfs/moritz11.pdfinsects; Volcanism in ... Modification of existing structures for new ... •E.g
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TodayMACROEVOLUTION• The fossil record & background extinction• Mass extinctions - the Cretaceous/Paleogene (“K/T”)
boundary - cause & consequenceTransitional forms• Terrestrial vertebrates (tetrapods)• Birds & evolution of feathersEvolution of development programs [Text Pp. 525-530]• The eye, vertebrate limbs
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The fossil record:billions of years ofsedimentation =>
recoverable history
• E.g. Grand Canyon &environs - layeredsediments from recent topre-Cambrian