BIOL 595-9-3-9 (F 2009)

BIOL 595-9-3-9 (F 2009) - BIOL 595 (Fall 2009) 9-3-09 Recap...

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BIOL 595 (Fall 2009) 9-3-09
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Recap 1) Targeted migration (PGCs) 2) The role of c-kit tyrosine kinase receptor 3) Meiosis versus mitosis 4) Spermatogenesis versus Oogenesis 5) Assisted Reproductive Technologies
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05_09 Early Mammalian Development
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Developmental Potential of Inner Cell Mass Becomes Restricted
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At 64-cell stage, the fates of ICM and trophoblast cells are determined ICM cells – is not able to become placental tissues, but all embryonic tissues Trophoblast cells – only give rise to placental tissues (no embryonic tissues) ICM Cells are said to be pluripotent  Pluripotent = “capable of forming many things”
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Blastomeres from 2- to 8-cell stage Each individual blastomere is capable of forming into blastocyst, which can then give rise  to the entire organism So at these stages, blastomere is totipotent Totipotent = “ capable of becoming anything ”
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BIOL 595-9-3-9 (F 2009) - BIOL 595 (Fall 2009) 9-3-09 Recap...

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