Test 3 Flashcards
(23 cards)
Mitotic cell divisions without cell growth in between
Cleavage Division
“Solid ball” stage of embryo
Morula
Formation of the hallow ball after many divisions in development
Blastula
Clump of cells formed within the first few days of development
Blastocyst
Blastocoel
Space between endoderm and ectoderm in development
During the gastrulla stage, this helps digest things
Archenteron
Opening to digestive track; it will become the mouth or anus
Blastopore
No body cavity
(A)coelomate
Body cavity lined with mesoderm
Coelomate
Body cavity that’s linked with mesoderm
Coelomate
Anus develops first from blasopore
Deuterostome
Mouth develops first from blastopore
Protostome
Only has ectoderm and endoderm while developing
Diploblastic
Has mesoderm, ectoderm, and endoderm
Triploblastic
Most recent common ancestor of animals
710 MYA
Their cleavage is spiral, their cells are determinate, and their coelom is formed via splitting
Protostomes
Their cleavage is radial, cells are indeterminate, their mouth is formed second after their anus
Deuterostomes
Phylum sponges are in
Porifera (filter feeders)
What is special about phylum Cnidarian (jelly’s, hydra, corals)
Tissues formed, it only has one opening, has nematocysts and cnidocyte
Phylum’s flatworms are in
Platyhelmithes
Feature of flatworms
Bilateral, pseudo acoelomate, 3 germ layers, only 1 gut opening
Rotifera classification
Bilateral, pseudocoelem
Three stages of development vs four stages of development
Incomplete vs Complete development
