32_Animal Diversity lec 2

32_Animal Diversity lec 2 - Animal Diversity Chapter 32...

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Chapter 32 Animal Diversity
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General Features of Animals 2 • Heterotrophy • Multicellularity • Tissues • Active movement • No cell walls • Diversity in form • Diversity in habitat • Sexual reproduction • Embryonic development
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General Features of Animals Heterotrophy - all animals are heterotrophs (they obtain there energy & organic molecules by ingesting other organisms). • herbivores • carnivores • omnivores • detritivores
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4 Multicellularity : many have complex bodies like the jellyfish No cell walls: quite flexible, many cells of animal bodies are held together by extracellular structural proteins such as collagen General Features of Animals Cont’ Active movement : • flying unique to animals • most can move; even sessile animals can move limbs (except sponges) • directly related to evolution of nerves & muscles
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5 Diversity in form : Range in size; most lack a backbone General Features of Animals Cont’ Sexual Reproduction : • cells form in meiosis function as gametes • haploid cells do not divide by mitosis 1 st (rather fuse directly to form the zygote)
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Embryonic Development : • zygote undergoes mitotic divisions (cleavage) General Features of Animals Cont’ • embryos of most kinds of animals develop into larva Tissues : • cells organized into structural & functional units • Animals unique to have two tissues associated with movement (expect in sponges)
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7 Evolution of the Animal Body Plan
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This note was uploaded on 06/13/2011 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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32_Animal Diversity lec 2 - Animal Diversity Chapter 32...

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