lab 8

Question 1

ectoderm

Answer 1

outer part one tissue derived = epidermis

Question 2

mesoderm

Answer 2

midde - one tissue derived = muscle tissue

Question 3

endoderm

Answer 3

inner - one tissue derived – stomach lining

Question 4

steps to embryonic development

Answer 4

Zygote – fertilized egg ( diploid)
Cleavage -
Eight stage cell -
Blastula -
Blastocoel
Gastrulation

Question 5

protostome

Answer 5

cleavage - spiral and determinate
coelom formation - solid masses of mesoderm split and form coelom

Fate of the blastospore- mouth develops from the blastospore

Question 6

Deuterostome

Answer 6

cleavage - radial and intermediate
coelom formation - folds of archenteron form coelom
fate of blastopore - anus develops form blastopore

Question 7

asymmetrical body plan

Answer 7

• no symmetry at all cannot divide the body into matching halves
• advantages -

Question 8

lophotrochozoan

Answer 8

lophophore for feeding + trochophore larvae

Question 9

ecdysozoans

Answer 9

have a cuticle exoskeleton that they shed