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A snapshot of the summary - Mens- en dierkunde1
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Thema 1: H3+H4 part 1
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What is a blastomere?Blastomere is a large cluster of small cells formed during cleavage
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Which pole is the animal pole and which is the vegetal pole?yolk rich = vegetal
other end = animal -
What does isolecithal egg mean?Iso=equal. Eggs with little yolk that is evenly distributed.
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what is an mesolecithal egg?meso=middle. Egg with moderate amount of yolk at vegetal pole
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What is invagination and what does it form?invagination is when 1 side of the blastula bends inwards. This forms a new cavity called gastrocoel, archenteron or oerdarm.
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What is a blastopore?opening to the gut where invagination began.
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Describe the 2 ways in which mesoderm can be formed?
- Schizocoely: cells arise from ventral area near blastophore lip and spread into space between archenteron and outer cell wall. --> protostomes
- Enterocoely: central region of archenteron wall puches outward into space between archenteron and outer body wall. --> deuterostomes
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What is the primary organizer and why?The dorsal lip, because it is the only tissue capable of inducing development of a secondary embryo in the host.
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What is epigenesis? And what are its 3 steps?view that an embryo develops and differentiates step by step from a zygote undergoing cell division.
- pattern formation
- determination of positions in the body
- induction of limbs and organs appropriate for that position
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Thema 1: H3+H4 part 2
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What is sonic hedgehog and what does it do?sonic hedgehog is secreted from the ZPA (zone of polarizing activity) and establishes the anteroposterior axis and it assusres that fingers/toes develop in appropriate order.
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