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Related Flashcards
Cards In This Set
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What is embryonic development?
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Changes that occur between the zygote stage and the muticellular organism
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What is a zygote cell?
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Diploid cell resulting from the union of two haploid gametes; 1st cell of 2nd generation
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What is an embryo?
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Young animal or plant while it still contained in a protective structure( e.g. seed coat, uterus)
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What are the 2 key processes?
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 cleavage: cell division -single zygote divides (forming many cells from one) gastrulation- infolding of a ball of cells gives rise of 2 3 embryonic tissue layers |
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What are the germ layers?
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-ectoderm-gives rise to epidermis and nervous tissue-endoderm-gives rise to lining of digestive and respiratory system
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If it only has 2 layers what is it called?
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Diploblastic
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Triploblastic with three layers have what?
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Mesoderm-internal organs , heart stomach
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Archenteron
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-rise to digestive space(gut cavity)
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Blastophore
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Mouth or anus or both
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When you have a gut cavity what can you do?
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You can digest larger particles
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What is so great about tissues?
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Enables body organization
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What is so great about the gut?
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Enables extracellular digestion (digest larger particles)
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What are the different symmetries?
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asymmetrical-spongesbilateral symmetry-phalhelminthes- single axis that divides the body into two equal halves-usually has a headradial symmetry-cnidarians-cut along one axis through the center along a bunch of different planes and you get symmetrical -only works if you looking at it from the top and through center
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What are some examples of the phylum cnidaria?
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Jelly fish, sea anemones,hydrozoans
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Describe some of the characteristics.
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-diploblastic, carnivorous, both nervous and muscle tissues-mostly marine
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