Exam 47: Animal Development

Cell migration occurs extensively during ________.

The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is ________.

The primitive streak in a bird is the functional equivalent of ________.

The formation of the fertilization envelope requires an increase in the cytosolic concentration of ________.

During fertilization, the acrosomal contents ________.

Which of the following is a result of gastrulation in animals? I.The archenteron is formed. II.The body axes are established. III.The germ layers are formed.

The arrangement of organs and tissues in their characteristic places in 3-D space defines ________.

Thalidomide, now banned for use as a sedative during pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy. Some of these women gave birth to children with limb and organ deformities, suggesting that the drug most likely influenced ________.

A human blastomere is ________.

Even in the absence of sperm, metabolic activity in an egg can be artificially activated by ________.

Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.

The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called ________.

Select the choice that correctly matches the organ with its embryonic sources.

At the time of implantation, the human embryo is called a ________.

The plasma membrane of the sea urchin egg ________.

The cortical reaction of sea urchin eggs functions directly in

At the moment of sperm penetration, human eggs ________.

Just prior to the onset of gastrulation in an embryo, the "organizer" cells are specified. If you were to experimentally block the specification of these cells, what would you expect the result to be in the developing embryo?

In which of the following organisms does holoblastic cleavage typically occur? I.sea urchins II.humans III.birds IV.fish

Embryonic induction, the influence of one group of cells on another group of cells, plays a critical role in embryonic development. In 1924, Hans Spemann and Hilde Mangold transplanted a piece of tissue that influences the formation of the notochord and neural tube, from the dorsal lip of an amphibian embryo to the ventral side of another amphibian embryo. If embryonic induction occurred, which of the following observations justifies the claim of embryonic induction?