Week 2 - Lophotrochozoa

Question 1

What is the Pattern of development for Protostomes?

Answer 1

• Blastopore becomes mouth
• coelom forms by splitting of mesoderm
• spiral cleavage
• determinate development

Question 2

What is the pattern of development for Deuterostomes?

Answer 2

• Blastopore becomes anus
• coelom forms from out pocketing of gut (except in vertebrates).
• radial cleavage

Question 3

What is cephalisation? What type of symmetry is it involved in?

Answer 3

• Differentiation of a head with a concentration
  of sensory receptors and nervous tissue.
• Bilateral symmetry

Question 4

What are the germ layers and where are they located?

Answer 4

Ectoderm - outside
Mesoderm - middle layer
Endoderm - gut wall

Question 5

What are the body cavity types? give 1 example of an organism with each type.

Answer 5

Acoelomate - platyhelminths
Pseudocoelomate - round worms
Coelomate - humans

Question 6

What are th4e 4 classes of flat worms?

Answer 6

Turbellaria - free-living flatworms
Monogenea - ectoparasitic flukes
Trematoda - endoparasitic flukes
Cestoda - tapeworms