Exam 43: Animal Development

Imagine looking at a slide of a cross section of a frog embryo that has just completed neurulation.Which is the sequence of structures you should see, beginning with inside the gut of the embryo and moving outward?

Neural tube defects during development

Parthenogenesis is the development of unfertilized eggs.Which is the most reasonable assumption about a parthenogenetic species?

Neural crest cells will become many different cell types in many different structures, including

A researcher working with developing fruit flies wants to produce a fly without gametes.Which element should be targeted for destruction in the early embryo prior to gastrulation in order to achieve this?

Both the yolk sac and allantois of a developing chick

Which is the typical chronological order in which structures appear during neurulation in the anterior region of an amphibian embryo?

The blocklike structures that form alongside the notochord around the time of neurulation are called _______.

Which statement about events during the neurulation stage of development is true?

Refer to the figure showing a scanning electron micrograph and figure of a chick embryo. Which labels in the two figures are pointing to the structure that will form vertebrae?

You are conducting an experiment that requires you to start a treatment on amphibian embryos when the nervous system starts developing.At which stage will you start the treatment?

A researcher working with frog zygotes experimentally disables the protein that inhibits GSK-3.What will be the immediate result?

If cells from the presumptive neural ectoderm of a late frog gastrula are transplanted onto the surface of a second late frog gastrula where skin would normally develop, the transplanted cells will still develop into neural tissue.This experiment shows that the transplanted cells are

You pull an unlabeled video out of a box labeled "Amphibian and sea urchin gastrulation." While watching the video, you decide it must be a video of a sea urchin embryo and not an amphibian embryo because you see that

If you turned a frog egg upside down, you would expect it to reorient relative to gravity because the dense yolk granules are concentrated in the _______ hemisphere of the egg in response to gravity.

Gene duplication during evolution resulted in vertebrates having multiple copies of the _______ gene complex that controls body segmentation.

In which way does the notochord differ from the neural tube?

Imagine looking at a slide containing a cross section of a frog embryo that has just completed neurulation.If you begin your examination at the dorsal surface of the embryo and moved inward, you will see, in sequence,

In frogs, the sperm penetrates the egg in the region of the

In both birds and mammals, gastrulation occurs in the