Chapter 3: Animal Architecture Flashcards
Having Balanced proportions and correspondence in shape on a median plane is ____.
Symmetry
Opposite of symmetry
-Not balanced
Asymmetry
Passing through the center divides a body in mirrored halves is an example of ____ ____
Spherical Symmetry
Body able to be divided into smaller halves with more than 2 planes on the longitudinal axis is ____ ____.
Radial Symmetry
Body being able to only be split by 1 or 2 planes on the longitudinal axis to produce mirrored halves is an example of ____ ____.
Biradial Symmetry
A ladybug is an example of ____ symmetry.
Bilateral
Animals divided along a saggittal plane into mirrored halves is an example of ____ symmetry
bilateral
Body plans begin with a single ____
zygote
After a zygote has been formed, it will divide into a larger number of smaller cells called _____
blastomeres
The process by which blastomeres are formed is called ____.
cleavage
What are the two types of cleavage and describe them?
Radial- tiers or layers of cells on top of one another
Spiral- cleavage planes diagonal to polar axis
Radial cleavage occurs with regulative development. What is that?
If a blastomere is separated it can adjust or regulate development
What is a blastocoel? What does it surround?
A fluid-filled cavity, it surrounds the cleavage
What is a blastula?
A hollow ball of cells
What does a blastula become?
Gastrula