Exam 38: Animal Development

Which feature(s)characterize(s)gastrulation in both birds and frogs?

In placental mammals,the collection of cells that secretes fluid to form the blastocoel is called the _______.

The _______ is an important structure for waste storage in birds and some mammals,but not in humans.

Which conclusion can be made from the experiments of Hans Spemann and Hilde Mangold in which they transplanted the dorsal lip of one salamander embryo to the ventral side of a second embryo?

The somites are derived from _______ tissue.

Dense clusters of yolk are concentrated in the _______ hemisphere of the unfertilized frog egg.

Some animal embryos establish axes early in development.In amphibian embryos,the anterior-posterior axis is determined by the

Exposure to cigarette smoke or alcohol is most dangerous to a human embryo or fetus during the _______ trimester.

A birth defect called holoprosencephaly results in the formation of a single central eye.This defect can be caused by environmental factors and mutations in the _______ gene.

We say that the birth of a human child is imminent when the pregnant mother's "water breaks." That "water" is produced by which extraembryonic membrane?

Cleavage in sea urchins and snails is similar in that both have a small amount of _______ in their eggs,allowing cleavage to be (complete or incomplete)_______.

Which protein is involved in development of the central nervous system and is named after a video game character?

Experimental evidence has shown that when cells from the presumptive neural ectoderm of a newt embryo in the late gastrula stage are transplanted onto the surface of a second late gastrula where epidermis would normally develop,the transplanted cells still develop into tissues of the nervous system.These results show that the transplanted cells are

Which event does not occur during cleavage?

The genome that is used to make the mRNA stored in the egg and to direct cleavage in the zygote is the same genome as that of the

A cell is said to be _______ when its fate has become restricted.

In sea urchin embryos,mesenchyme cells are able to elongate the archenteron by using

The segmented characteristic of human embryonic development is evident from the bricklike structures called _______ that form in paired rows lateral to the notochord.

In a chick embryo,the processes of gas exchange and waste removal are

When a pregnant woman's water breaks,the fetus's _______ has burst,releasing its fluid.