Exam 2 Flashcards
What is a Cleavage?
Orderly sequence of cell divisions of the fertilized eggs by mitosis.
What is the process of orderly sequence of cell divisions of the fertilized eggs by mitosis
Cleavage
What is a blastula?
Single layer cells of hollow, fluid filled balls of cells.
What is a single layer cell of hollow fluid filler balls of cells.
Blastula
What is a Blastocoel?
The cavity of the blastula?
What is the cavity of the blastula called?
Blastocoel.
What is a radial cleavage?
The stacking position of 8+ cells straight up.
Cell stacked straight up is called?
Radial Cleavage
What is a spiral cleavage?
The Stacking position of 8+cell between each other.
Cells stacked in-between each other?
Spiral Cleavage
What stage do sponges reach?
Blastula Stage
The blastula stage is the ending stage for which group.
Sponges
How are animal development categories?
-Cleavage and Number of Tissue Layer
Sponges have how many tissue layers.
Zero
Which animal has no tissue layer?
Sponges
Phylum Cnidaria has how many tissue layer?
Two
Which Phylum only has two tissue layers?
Phylum Cnidaria
What is a diploblastic.
A two tissue layer.
A blastula gets pushed in to make a ____.
Gastrula.
A gastrula contains_____.
Ectoderm, endoderm, blastopore, blastocoel, gastrocoel
What is a triploblastic?
A three layer tissue layer.
What are the types of tissue of a triploblastic.
Mesoderm, endoderm, ectoderm
The endoderm give rise to the ____.
Mesoderm
Where does the mesoderm come from?
The endoderm.
What forms from the mesoderm?
Heart, lung, bones, muscles
Where do the heart, lung, bone and muscle come from?
Mesoderm
What form from the ectoderm?
Skin, Nervous system, eyes
Where do skin, nervous system and eye form from?
Ectoderm
What forms from the endoderm?
Digestive system, liver, gallbladder.
Where do the digestive system, liver and gallbladder form from?
Endoderm
What cleavage pattern does protostomes have?
Spiral Cleavage.
Which phylum is a protostomia?
Phylum Playthelminthes, annelida, arthropodo, mollusca.
What are the fate of the cell of a protostome?
Determinate cleavage
What is a determinate cleavage?
Cells fate became determined very early.
What is the fate of the blastopore of the protostomes?
The blastopore becomes the mouth.
Which clades blastopore gives rise to a mouth?
Protostomia
Which clades blastopore gives rise to an anus?
Deuterostomes
