Exam 43: Animal Development

Questions 18-22 refer to the figure above illustrating the stages of animal reproduction and development. -Primary tissue layers form by cell divisions, cell migrations, and rearrangements at this stage.

This stage occurs in the parents.

The gray crescent in frogs

Cleavage produces the

The mesoderm is responsible for the formation of all of the following organ systems EXCEPT the

Which stage in reproduction and development occurs before the others?

The heart, muscles, bones, and blood develop primarily from

Which of the following events occurs over the longest period of time in humans?

In the process of blastula formation,

Which stage of development involves initial cellular reorganization?

Gastrulation produces

Which of the following developmental events occurs last?

In frogs, the gray crescent appears

Which of the following is a single-layered, fluid-filled ball of cells?

A zygote is formed at this stage.

Organ formation is indicated by

A zygote forms

Which embryonic tissue is incorrectly associated with its derivative?

Muscles differentiate from which tissue?

The primary tissue layers are formed in which of the following stages?