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Samenvatting Chordata, vertebraten HD 34 Campbell Biology
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Samenvatting Chordata en vertebraten
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12th class biology chapter 14th
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Samenvatting chordata en vertebratenCriteria voor indeling:
• Weefsels: Geen echte weefsels, vs weefsels
afkomstig van 2 of 3 kiembladen.
• Radiale vs Bilaterale symmetrie Cnidaria
radiaal, ´hogere´ phyla zijn bilateraal
symmetrisch.
• Lichaamsholte (Coeloom: a-, pseudo- &
coelomata)
• Protostomia vs Deuterostomia
Protostomia Deuterostomia
Type klieving Spiraal / Determinatief Radiaal /
Niet-determinatief
Type coeloomvorming Splijting Vouwing
Blastoporus wordt Mond Anus
Omkering organen
DPP & BMP (transforming growth factors) blokkeren
neuronvorming. Sog & chordin komen resp. ventraal
(arthropod) en dorsaal (tetrapod) tot expressie en leiden, via
deblokkering, tot vorming van zenuwstreng ventraal of
dorsaal
, Echinodermate (stekelhuidigen)
Bilateraal sym? Alleen de larvale stadium
Sessiel of langzaam bewegend
Endoskelet van calciumplaatjes
Stekels ter bescherming
Symmetrie:
Larve: bilateraal
Adult: secundair “radiair”
Watervaatstelsel en buisvoetjes:
Voortbeweging
Voedselverwerving
Gaswisseling
Voortplanting:
(a)seksueel : gonaden met spermacellen of eicellen die geloosd worden in zee
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