Print Chapter 28 Pregnancy and Human Development ExamCells on the dorsal surface of the two-layered embryonic disc migrate to form a raised groove known as the ________. A) blastocyst B) amnion format ... ion C) germ cell formation D) primitive streak) The result of polyspermy in humans is ________. A) multiple births B) a nonfunctional zygote C) interruption of meiosis D) mitotic insufficiencyIt is impossible for sperm to be functional (able to fertilize the egg) until after ________. A) the tail disappears B) they become spermatids C) they undergo capacitation D) they have been stored in the uterus for several days [Show More]
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