Origins and Life Histories

Origins and Life Histories
metazOa

Egg embryO’s
Embryo
Germ
Layers
Eggs
Ovum
Yolk 
Yellow food
Polar
Animal-vegetal
Animal embryo
Vegetal digestive
Isolecithal, small yolk equal
Telolecithal, tell those vegetables
Centrolecithal, variable 
LinearCleavage 
Zygote begot cleav’d
Hol oblastic 
Whole cut goes thru
Meroblastic
Ya mero 
Equal bastomeres
Some not so equal
Larger macromere glutton
Micro one 
Longitude 
Long globe
Latitude
Tall attitude
raised
radial cleavage
animal 
axis
cross even
polar view
slices similar
symmetric
spiral 
first slices tall
lie furrows crevice
vices to the eyes
lies in position
myotic spindles
division 
four
clockwise
next, 
counterclockwise
then clock wise
then again
got wise yet?

In the woods
E.B. Wilson would 
decode
Embryos Coding 
Intesive studies
On the polychete worm
In the laboratory
Traces cell’s fate
Followed accounts
To recount its stories
Rmained in his memory
Taken to his grave
Introductory courses
Saved the day
For him and his name
To this time
No one knows if he should
Have doled his glory

Cell Fates
In the market 
Sell the faded dames
A scarf
A seductive fad
A destructive fashion
A determined fate 
Established young

Determinate cleavage




Life cyclO’s

OntOgeny an’ phylogeny