Exam 42: Animal Development

The placenta

MATCHING Matching.Choose the one best answer for each numbered item. a.visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin b.the formation of two or three embryonic tissue layers c.the fusion of male and female nuclei d.the entire body divides transversely; each half grows and regenerates the missing part e.selective gene expression results in different cell types f.subdividing of the zygote by mitosis; no growth occurs g.region of zygote that has less yolk and is pigmented h.an embryonic stage of development that has three primary tissue layers before organogenesis begins i.the formation of organs j. one body part develops in response to signals from an adjacent part k.the growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results l. occurs in the formation of the human hand -embryonic induction

Classification.Respond to the following statements with reference to the five terms listed below. a.zygote b.blastula c.cleavage d.gastrula e.somites -This stage appears as a multicell, fluid-filled ball.

Classification.Respond to the following statements with reference to the five terms below. a.somites b.blastomeres c.ectoderm d.mesoderm e.endoderm -This starts the gut's inner lining.

MATCHING Matching.Choose the one best answer for each numbered item. a.visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin b.the formation of two or three embryonic tissue layers c.the fusion of male and female nuclei d.the entire body divides transversely; each half grows and regenerates the missing part e.selective gene expression results in different cell types f.subdividing of the zygote by mitosis; no growth occurs g.region of zygote that has less yolk and is pigmented h.an embryonic stage of development that has three primary tissue layers before organogenesis begins i.the formation of organs j. one body part develops in response to signals from an adjacent part k.the growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results l. occurs in the formation of the human hand -differentiation

Milk production in women is stimulated by

The following questions refer to the figure above illustrating frog development. -Fertilization is indicated by

Which embryonic tissue is incorrectly associated with its derivative?

Most often, three tissue layers form: outer __________, inner __________, and __________ in between the first two layers.