Chapter 25: What is an Animal? 25.1: Typical Animal Characteristics.
What is an animal?
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Transcript of What is an animal?
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What is an animal?
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Animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers.
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How do animals differ
from plants?
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Animals lack cell walls and havehave collagen as their mostabundant protein.
Animals have nerve and muscle cells.
Animals have three distinct cell junc-tions: tight junctions, desmosomes, and gap junctions.
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Early Embryonic Development
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A Traditional View of Animal Diversity Based on Body-Plan Grades
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Body Symmetry in Animals
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Body Plans of the Bilateria
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Protostomesvs. Deuterostomes
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Animal Phylogeny Based on Sequencing of SSU-rRNA
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Figure 47.6x Sea urchin development, from single cell to larva
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Cleavage in an echinoderm (sea urchin) embryo
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Cleavage in a frog embryo
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Cross section of a frog blastula
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Gastrulation in a frog embryo