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19 Cards in this Set
- Front
- Back
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What makes an animal part of the phylum animalia?
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Ingestive, multicellular, heterotophic.
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Define radial
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from a central point
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What is a blastula?
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A hollow ball of cells formed after the 8 cell split of a zygote. It goes on to form a gastrulation which invaginates to form mesoderm, endoderm, and ectoderm.
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What type of animal is better suited for radial symmetry?
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sessile animals that can encounter the world at all angles.
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What type of animal is better suited for bilateral symmetry?
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An animal that moves through the water in search of food. It is more beneficial to have the sensory organs located at the front of the animal.
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Describe the lifecycle of a zygote to a gastrula.
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Zygote --> cleavage --> beta-cell stage --> blastocoel --> invagination in gastrulation becomes gut --> gastrula.
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What are the two types of coelem formation?
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Schizocoelous and enterocoelous formation.
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Describe Schizocoelous formation.
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Coelom begins as two pockets of mesoderm within the blastocoel. A split forms within the msoderm in which coelem forms and matures.
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Describe enterocoelous formation.
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Archenteron invaginates blastula. Future mesoderm evaginates and splits off from devloping gut into a ceolomic pouch which matures into coelom.
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What is the primitive connective tissue found in flatworms?
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Mesenchyme
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Where are the gonads found in flatworms?
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Mesenchyme
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What type of skeleton does a roundworm have?
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Hydrostatic skeleton.
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Describe radial cleavage.
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Planes of zygote are perpendicular to each other. They will substitute lost cells.
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Describe spiral cleavage.
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Cell splites in a clockwise tierre the first time, then counterclocwise a second time. Each cell encodes for a particular thing. e.g. the 4d cell codes for the mesoderm and is termed the "mesento" cell
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Concerning the blastopore, what are the primary differences between deuterostomes and protostomes?
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Deuterostomes have blastopores that become the anus and their mouth is a new opening, whereas protostomes have a blastopore that becomes a mouth and their anus is a new opening.
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What are the features of deuterostomes?
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Blastopore becomes anus, upstream collecting with few cilia as larvae, radial cleavage, eneterocoleous formation.
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What are the features of protostomes?
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Blastopore becomes mouth, downstream collecting with many cilia as larvae, spiral cleavage, and Schizocoleous formation.
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Name the protostome phyla.
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Platyhelminthes (flatworms), Nematoda (roundworms), Rotifera, Molluska, Annelida (earthworms), Arthropoda
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Name the deuterosome phyla
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Lophoporates, echinodermata, chordata
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