Lab 8 - Embryonic Development

Question 1

What is a zygote?

Answer 1

A fertilized egg; the first cell of a new organism.

Question 2

What is cleavage?

Answer 2

Rapid mitotic cell divisions without growth.

Question 3

What is the eight-cell stage?

Answer 3

Early cleavage stage consisting of eight small, identical cells.

Question 4

What is a blastula?

Answer 4

A hollow ball of cells formed after cleavage.

Question 5

What is the blastocoel?

Answer 5

The fluid-filled cavity inside the blastula.

Question 6

What is gastrulation?

Answer 6

The process where cells move inward to form germ layers.

Question 7

What is a gastrula?

Answer 7

The embryo after gastrulation with formed germ layers.

Question 8

What is the blastopore?

Answer 8

The opening formed during gastrulation.

Question 9

What is the archenteron?

Answer 9

The primitive gut formed during gastrulation.

Question 10

What is the ectoderm?

Answer 10

Outer germ layer → forms skin & nervous system.

Question 11

What is the endoderm?

Answer 11

Inner germ layer → forms digestive & respiratory lining.

Question 12

Stages of development

Answer 12

zygote - > (cleavage) -> 8-cell stage -> (cleavage) -> blastula -> gastrulation -> gastrula