Summary: Mens- En Dierkunde1
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Thema 1: H3+H4 part 1
This is a preview. There are 14 more flashcards available for chapter 14/03/2015
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What is a blastomere?
Blastomere is a large cluster of small cells formed during cleavage -
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. -
what is an mesolecithal egg?
meso=middle. Egg with moderate amount of yolk at vegetal pole -
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. -
What is a blastopore?
opening to the gut where invagination began. -
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. -
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
This is a preview. There are 25 more flashcards available for chapter 15/03/2015
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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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