Exam 32: An Amazingly Detailed Script: Animal Development

Versions of homeobox genes have been found in plants and fungi.

Without cell adhesion,the primitive gut probably wouldn't develop during gastrulation.

The mouth is the last thing produced by growth of the archenteron through the sea urchin gastrula.

Refer to the figure below, and then answer the question that follows. -Which label,A,B,or C,points to a structure formed from the archenteron during gastrulation?

Even small concentrations of bicoid protein will cause the anterior portion of an organism to form there.

During gastrulation in sea urchins,which forms first,the mouth or the anus?

Menopause and puberty are both examples of developmental changes.

Evaluate and explain the importance of positional information and morphogens in induction.

The phase during which embryonic cells arrange themselves into three layers is called:

The morula stage is part of which phase of embryonic development?

What is the significance of the homeobox sequence studied in animal species?

The blastocoel is:

The end of a zygote that contains less yolk is the animal pole.

If you could stop diffusion of substances in fruit fly zygotes,could you stop normal development? Why or why not?

Gastrulation begins at the sea urchin blastula's vegetal pole.

Eye cells can become beak cells once they are committed.

In sea urchin development,the archenteron becomes the:

If an organism is missing the outer layer of skin upon birth,which of the following might be the cause?

Without programmed cell death,your ________ might look more like a ________.