Development of multicellular organisms

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What does sperm penetration cause
causes ca2+ wave. 2nd mitotic division, release secondary polar body. also male/female pronuclear fusion. blocks polyspermy.
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What is the egg corticol reaction?
membrane forms. fluid pumps out to prevent anymore sperms entering.
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Ectoderm
external organs, skin, NS, eyes, tooth, cornea.
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Mesoderm
middle tissue, cartillage, skeletal muscle, wall of gut.
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Endoderm
internal organs. stomach, colon, lungs, bladder, thyroid.
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CNS formation
Pax 6. neural plate invaginates to form brain and spinal cord.
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Card 2

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What is the egg corticol reaction?

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membrane forms. fluid pumps out to prevent anymore sperms entering.

Card 3

Front

Ectoderm

Back

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Card 4

Front

Mesoderm

Back

Preview of the front of card 4

Card 5

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Endoderm

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