Development

Development - Development 1. fertilization 2. cleavage 3....

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Development 1. fertilization 2. cleavage 3. blastulatoin 4. gatstrulatoin 5. organogenesis Differing life history – Traits / strategies 4 typical organisms use for research of development each with different amounts of yolk in egg o Echniderms – starfish eggs are tiny with virtually no yolk o Frog egg has moderate amount of yolk lasting until develops to tadpole o Chickens egg has lots of yolk meaning lots of food to eat in development o Humans no yolk in egg, buy embryo develops in but embryo develops 1) Fertilization – group of events, not just single event (gamete anatomy) a) human sperm: acrosome – structure at tip of sperm; membrane containing enzyme b) human egg (2 nd oocyte) anatomy: in 2 nd oocyte zona pellucida – non-celllar clear area granulose cells – exterior to zona pellucide; parts of follicle blastomere(?) blastula imples the whole thing develops into the organism; blastocyst is when only a portion of the unit develops into the embryo o twins: identical (monozygotic) 2 inner cell mass begins totipotency pluripotency – cells can give rise to many but not all
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This note was uploaded on 11/09/2011 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Development - Development 1. fertilization 2. cleavage 3....

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