Bio 2 Lab Pract 1 Devolpment Lab 1

Front 1

What type of egg is a unfertilized Starfish egg?

Back 1

Isolecithal

Front 2

Fertilized Egg Starfish

Back 2

fert starfish, you can see the hazyness meaning it devolping fast block to polyspermy. AKA Fertilzation envolope

Front 3

2 cell stage of Starfish

Back 3

starfish holoblastic cleavage

isoelthical

Front 4

Blastula can be indentified how?

Back 4

by to complete formation of the blastocoel

Front 5

Early gastrula can be identified by?

Back 5

Beginning formation of blastopore and archenteron

Front 6

What is the difference between early and late gastrula

Back 6

Deeper archenteron (5)

Front 7

What does frog early cleavage look like? Which is the animal pole?

Back 7

Blastomeres 2 4 8 16 cell stage
very Moderately telolectihal and holoblastic(almost complete even cleavage) Animal pole has more cleavage more blastomeres!!!!

Front 8

Late cleavage is determined by?

Back 8

blastocoel forming in the middle

Front 9

What does the blastula have?

Back 9

Blastocoel

Front 10

What does the frog have in the gastrula stage?

Back 10

Yolk plug, archenteron

Front 11

What is the difference between early neural tube stage and late in the frog?

Back 11

The neural tube not fully devolped, the neural grove and neural folds presnt and the gut is not devolped (archenteron still visible)

Front 12

Late neural stage in Frog

Back 12

Gut is present fully devolped neural tube and notocord

Front 13

What is begining to form in 18 hour chick?

Back 13

Beginning brain

Also chick is a telolecithal egg with meroblastic cleavage
Ectoderm = nervous system

Front 14

What is beginning to form in 21 hour chick?

Back 14

Spinal Cord also the neurla folds are devolped around the beggining spinal cord.

Front 15

What is beginning (visible) form in 48 hour chick?

Back 15

Otic and optic vsicle
Somites are the block like structures along the thin spinal cord. Vitelline blood vessels (not seen here) are tree branch like sturcuters exending out from the bottom somite

Front 16

What is the anterior and posterior limb buds look like in 96 hour chick and where are they located?

Back 16

Anterior(wing)behind heart posterior(legs)near the tail

Front 17

Are the animals we looked at deuterostome or protosome?

Back 17

They are all deuterostome meaning the blastopore becomes the anus.

Front 18

What types of eggs are the Starfish, Frog, and chick. What type of cleavage pattern do they follow?

Back 18

The starfish is isolecithal,and the Frog mesolecithal and the chick is teloecithal.

Holoblastic cleavage, or division of the entire egg, occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins, frogs, and mammals. the Chick is the meroblastic cleavage pattern uneven.

Front 19

What does the ectoderm become?

Back 19

The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye.

Front 20

What does the endoderm become?

Back 20

The innermost of the three primary germ layers in animal embryos; lines the archenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract.

Front 21

What does the mesoderm become?

Back 21

The middle primary germ layer of an early embryo that develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system.