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16 Cards in this Set
- Front
- Back
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Choanoflagellates |
Likely ancestor of animals colonial group |
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635 mya |
plants and animals appeared |
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540 mya |
Cambrian explosion |
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Dioecious |
Separate sexes Organism has ovaries OR testes |
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Monoecious |
Hermaphroditic Organism has ovaries AND testes |
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oviparous |
eggs embryo gets food from yolk in egg later hatches External development |
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ovoviviparous |
Live birth
Food still from yolk internal development |
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viviparous |
Internal development live birth food from mother's placenta |
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Direct development |
continuous growth until adult form is reached |
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indirect development |
juveniles exist as larvae then metamorphosis |
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Anterior end |
Head end |
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posterior end |
tail end |
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ventral |
front or belly side |
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dorsal |
back or upper side |
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heterochrony |
mutations in timing of gene expression during development can lead to novel body forms |
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paedomorphosis |
reproductive development accelerates relative to somatic development juvenile able to reproduce |
