Animal Development

a major difference between a deuterostome and a protostome is...

• in protostomes, there is radial cleavage.
• in deuterostomes, there is spiral cleavage.
• in protostomes, there is spiral cleavage.
• None of these.

Animals in which the blastopore becomes the mouth.

• protostomes
• deuterostomes
• echinoderms
• chordates

Animals in which the blastopore becomes the anus.

• deuterostomes
• protostomes
• invertebrates
• poriferans

Frogs are......

• Protostomes
• Deuterostomes

What is a blastula?

• Opening to ball of cells
• Hollow ball of cells
• A fertilized egg
• An indention in a ball of cells

What is the first thing to happen to a blastula when forming the gastrula?

• It gets bigger.
• It gets smaller.
• It indents.

Where is the endoderm?

• Inner layer
• Middle layer
• Outer layer

Where is the ectoderm?

• Inner layer
• Middle layer
• Outer layer

Where is the mesoderm?

• Inner layer
• Middle layer
• Outer layer

What does the mesoderm become?

• Skin
• Digestive system
• Muscle
• Brain