Exam 42: Animal Development

Which of the following is NOT true regarding apoptosis?

By the eighth week in humans

During implantation, the __________ buries itself in the uterine wall.

Select the correct sequence of animal developmental events.

Classification.Respond to the following statements with reference to the five terms below. a.somites b.blastomeres c.ectoderm d.mesoderm e.endoderm -It forms between the other two primary tissue layers.

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 -gastrulation

Gastrulation produces

__________ results in an early embryo that has two or three primary tissue layers.

A woman has discovered she is pregnant.What should she avoid to reduce the risk of injuring the fetus or having a miscarriage?

Use the figure above to answer the following questions. -The letter "A" from the above figure represents

__________ regulates the maturation of the mammary glands, and then oxytocin causes __________.

Diffusion of morphogens--products of master genes--creates gradients that cause the differential expression of other genes such as __________, which govern the formation of specific body parts.

A fetus born earlier than ___ weeks is considered premature.

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 is the fertilized egg.

Which stage in reproduction and development occurs before the others?

Classification.Respond to the following statements with reference to the five terms listed below. a.zygote b.blastula c.cleavage d.gastrula e.somites -Its cellular descendents give rise to all tissue and organs.

Use the figure above showing developmental day 14 to answer the following questions. -The yolk sac is indicated by

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 -cleavage

Which of the following statements is false regarding alcohol consumption during pregnancy?

Which stage of development involves initial cellular reorganization?