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The end product of cleavage is a ______. a. gamete b. blastula c. gastrula d. zygote

The outermost germ layer in a vertebrate gastrula is the ______. a. endoderm b. ectoderm c. mesoderm d. dermis

A morphogen ______. a. diffuses through an embryo b. has different effects at different concentrations c. influences gene expression d. all of the al

Match each term with the most suitable description. _____ apoptosis _____ embryonic induction _____ cleavage _____ gastrulation _____ implantation a. blastomeres form b. cellular rearrangements form primary tissues c. cells die on cue d. cells influence neighbors e. blastocyst burrows into the uterus

In humans, fertilization typically occurs in the ______. a. vagina b. uterus c. cervix d. oviduct

The _____, a fluid-filled sac, surrounds and protects a human embryo and keeps it from drying out. a. amnion b. allantois c. yolk sac d. chorion

The placenta consists of ______. a. embryonic tissue b. maternal tissue c. paternal tissue d. a combination of a and b

During the fetal period, _______. a. gastrulation ends b. somites form c. a tail forms d. limb movements begin

Human milk contains ______. a. sugars b. lysozyme c. antibodies d. all of the above

Match each hormone with its action(s). _____ prolactin _____ oxytocin _____ human chorionic gonadotropin a. milk protein production b. sustains corpus luteum c. causes contraction of uterus, milk ducts