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Unformatted text preview: x Stage That Implants Into Uterus ! Embryo x Embryo : Developmental stages occurring from the 3 rd Week through the 8 th Week. x Stage that Organogenesis occurs ! x Organogenesis : Fetus x Fetus : Developmental Stages Occurring From The 9 th Week Through Birth. Whaaaaa aaaaaa !!! Twins X Identical : Twins that develop from a single Ovum fertilized by a single Spermatozoa. s Always the same sex ! X Fraternal : Twins that develop from two different Ova that are fertilized by two different Spermatozoa. Stem Cells x They are Undifferentiated Cells ! x Two Primary Sources : 1 . 2 . x As Undifferentiated Cells They Can Potentially Be Turned Into any Human Tissue !...
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