Exam 38: Animal Development

One of Hans Spemann's important experiments involved

Which organisms feature a body plan with repeating segments (somites)that are modified during development into structures such as ribs and muscles?

The primitive groove of bird and mammalian embryos is analogous to the _______ of amphibians and sea urchins.

In organisms such as the chick,in which the egg has extensive yolk,the egg

The large amount of yolk in birds' eggs results in _______ cleavage.

The human embryo is able to split at the 64-cell stage to produce two viable progeny.This is an indication that human development at this stage is

One function of the allantois is the

In a triploblastic organism,the ectoderm gives rise to the _______ and _______.

The gray crescent is the region of the amphibian egg

If you treat unfertilized frog eggs with a poison that prevents microtubules from forming and then fertilize the eggs with sperm,the first abnormal event you would notice would most likely be

Which statement about the allantois is true?

In chick embryos,the extraembryonic membrane that forms around the yolk is the _______.

Sensory neurons are derived from

The epiblast and hypoblast are structures found in _______ development.

Cleavage in human embryos _______,whereas cleavage in frog embryos _______.

If one of the blastomeres is removed from a developing mouse embryo,the remaining cells will still develop into a normal mouse.This is an example of

Noggin and Chordin are signaling molecules released by the developing notochord that block BMP4,thereby allowing the formation of the _______.

Using the figure of the vertebrate embryo below,list in order the structures that the arrow passes through,starting from the tail of the arrow and ending at its tip.

If you shift the position of a fruit fly egg relative to the follicle cells as the egg is developing in the ovary,you can expect that the

Of the three germ layers that develop during gastrulation,the _______ layer gives rise to the lining of the digestive tract.