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Lecture 40

BIOL 1010 Lecture 40: Lecture 40

3 Pages

Biological Sciences
Course Code
BIOL 1010
Emily A.Mc Kinnon

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o78P Bio 1010 o Cell junctions, Nerve & Muscle cells. o Sexually reproduce with life cycle of Embryonic stages. o Developmental genes. o Gametes alone represent haploid stage of life cycle. Section 20.2 – Animal diversification began more than half a BYA. (Billion years ago) Oldest accepted animals are known/found to be 575-550 MYA. (Ediacaran period) o Discovered in 1940’s in Australia. o Similar found in Asia, Africa & North America. o Impressions of soft body animal’s 1cm-1m in length. Invertebrates (Sponges, Cnidarians) do not appear to be closely related to any living organism. Animal diversification rapidly accelerated from 535-525 MYA. (Cambrian period/explosion) Cambrian animals had hard body parts such has shells & spikes. (Related to existing animal groups) o 1/3 of species found in Burgess Shale are Arthropods (Crab, shrimp, insects) o Member of our phylum, Chordata. (Hallucigenia & Anomalocaris). What created Cambrian Explosion Hypothesis: Increase complex predator-prey relationship Increase in atmospheric o
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