Stem cells 0.0 / 5 ? BiologyAll LevelsAll boards Created by: AlexCreated on: 27-05-13 19:15 In cells division, what is cleavage? Mitotic cell divisions, without growth, that converts the zygote into a multicellular blastula 1 of 20 whats a totipoten cell has a complete set of genetic instructions required to direct normal development of an organism 2 of 20 8 stages of early embryo development 1. Zygote (egg+sperm) 2.totipotent fertilised egg 3.2 cell stage 4.4 cell stage 5.early 8 cel 6.compacted 8 cell 7. morula 8-16-32 cells 8.blastocyst 32-64 cells 3 of 20 whats a blastula Hollow ball of cells produced by cleavage of a fertilised ovum 4 of 20 whats a blastocyst A mammalian blastula 5 of 20 what are the 2 distinctive tissues in the blastocyst stage Inner cell mass and Trophectoderm/trophoblast 6 of 20 whats the function of the inner cell mass Give rise to embryonic tissues & yolk sac - one side of ring of trophoblast cells 7 of 20 What does the placenta develop from? the trophectoderm 8 of 20 Whats the chorion extraembryonic membrane that forms an outer cover around the embryo and in mammals contributes to formation of the placenta 9 of 20 pluirpotent cell can give rise to all embryonic tissue - not all type of cells 10 of 20 clonogenic give rise to a cone of cells 11 of 20 what is dipause? Suspended growth/development 12 of 20 why does dipause happen? arrest embyonic development - so young born at the optial time 13 of 20 what regulates diapause? LIF (Leukemia inhibitory factor) - mediates cellular pathways that maintian self-renewal 14 of 20 Totipotent stem cel Sufficient to form entire organism - zygot 15 of 20 Pluripotent Able to form all body's lineages including germ cell and some extraembryonic cells 16 of 20 multipotent can form multiple lineages that constitue an entire tissue or tissues 17 of 20 unipotent cells with capacity to give rise to a single cell type 18 of 20 which are the main transcription factors in regulating pluripotency Oct-4 and Nanog 19 of 20 types of stem cells embryonic, fetal, adult and reprogrammed cells 20 of 20
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