Ch 2 Animal Reproduction, Development Classification

Soon after fertilization, the zygote undergoes a series of rapid cell divisions. This is called

• Meiosis
• Gastrulation
• Organogenesis
• Cleavage

The solid ball of cells that results from the dividing zygote is called

• Blastula
• Morula
• Gastrula
• Blastomere

During cleavage, each cell in the embryo is called a

• Blastula
• Morula
• Gastrula
• Blastomere

The stage that results in three germ layers and a primitive gut is the

• Blastula
• Morula
• Gastrula
• Blastomere

Radial cleavage is found primarily in which group?

• Protostomes
• Deuterostomes
• Both groups
• Neither group

Early in cleavage, a cell breaks off and becomes isolated. It grows into an entire separate individual. This is an example of

• Mosaic development found in Deuterostomes
• Mosaic development found in Protostomes
• Regulative development found in Deuterostomes
• Regulative development found in Protostomes

The blastopore will become the mouth in

• Protostomes
• Deuterostomes
• Both groups
• Neither group

Most protostomes show this type of coelom formation where a band of mesoderm splits to form the:

• Enterocoelous
• Schizocoelous
• Pseudocoelom
• Acoelom

Different kinds of symmetry make it possible for animals to:

• Grow very large
• Survive when cut into pieces
• Move and find food in different ways
• Live a long time

If you divided a radially symmetrical animal along any plane through its central axis, you would end up with:

• Roughly equal halves
• Front and back halves
• Top and bottom halves
• Three pieces