1	each organ takes shape during embroyonic period		_____	organogenesis
2	watertight membrane, protects embryo		_____	neural tube
3	through this tissue (fed by blood vessels from the mother) the embryo receives nutrients		_____	blastocyst
4	a membrane that eventually becomes the placenta		_____	placenta
5	bottom of neural tube eventually becomes this		_____	in vitro fertization
6	undifferentiated tissue becomes testes depending on this chromosome		_____	zygote
7	lumps appear at the top of this forming the beginning of a primitive brain		_____	Y
8	not being able to get pregnant after a year		_____	embryonic period
9	reproductive tech: injection of sperm into the womb		_____	spinal cord
10	reproductive tech: several eggs manually combined with sperm in a lab dish		_____	amnion
11	single cell formed at conception		_____	germinal period
12	first two weeks of pregnancy, formation of blastocyst		_____	chorion
13	a ball of about 150 cells which implants in uterus about Day 6		_____	infertility
14	third to eighth week of pregnancy		_____	anencephaly
15	more common lethal defect when the mother is deficient in folic acid		_____	artificial insemination