Unit 2 Terms - Architectural Patterns

Question 1

union of male and female gametes

Answer 1

fertilization

Question 2

fertilized egg

Answer 2

zygote

Question 3

entrance into the egg of more than one sperm

Answer 3

polyspermy

Question 4

sequence of mitotic divisions in early embryonic development

Answer 4

cleavage

Question 5

cells produced by early cleavage

Answer 5

blastomeres

Question 6

going from an embryo to a miniature adult

Answer 6

direct development

Question 7

going from embryo to larval stages to adult stage

Answer 7

indirect development

Question 8

early embryonic stage in animals in which embryo is a hollow mass of cells

Answer 8

blastula

Question 9

central fluid-filled cavity at center of blastula

Answer 9

blastocoel

Question 10

process of converting blastula into a 2-3 layered embryo

Answer 10

gastrulation

Question 11

new internal pouch or gut cavity within the gastrula

Answer 11

archenteron or gastrocoel

Question 12

in an embryo, one of 3 basic layers (ectoderm, mesoderm, endoderm) from which all organs and tissues arise in the animal

Answer 12

germ layers

Question 13

having only 2 germ layers during embryonic development

Answer 13

diploblastic

Question 14

having all 3 germ layers during embryonic development

Answer 14

triploblastic

Question 15

a mesoderm-lined body cavity

Answer 15

coelom

Question 16

mesoderm is derived from endoderm near the blastopore

Answer 16

schizocoely

Question 17

mesoderm is derived from endoderm mid-way along gut

Answer 17

enterocoely

Question 18

animal which has an embryonic development pattern that includes:

• spiral cleavage
• schizocoely
• the blastopore becomes the mouth

Answer 18

protostome

Question 19

animal which has an embryonic development pattern that includes:

• radial cleavage
• enterocoely
• the blastopore becomes the anus

Answer 19

deuterostome