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animals with Bilateral Symmetry can have a _____ nervous system
More advanced
- head, brain (cephalic ganglion)
Triploblastic
Grastula has 3 layers
- can have in/complete digestive tract
- can rely less on diffusion
Why can triploblastic organisms rely less on diffusion
They can have a circulatory system; respiratory system and/or excretory organs
Radial Cleavage
Among vertebrates; echinoderms, etc.
- cells divide at right angles
- cells equal in size an shape
- can have stem cells- cell fates depend on stage and location
- can get identical twins
- regulative development
Spiral Clevage
Most invertebrates
- divide at oblique angles
- cell fates fixed: no id, no twins , no stem cells
- ideal for genetic studies of mutations
macromeres
large cells with yolk
- at one end of the embryo Vegetal pole
micromeres
Small cells, no yolk
- at animal pole
