EMBRYOGENESIS AND SPECIFICATION - MORPHOGENESIS

Question 1

What is embryogenesis

Answer 1

the process by which a zygote becomes an embryo

Question 2

how does a zygote go from one to many cells

Answer 2

Cleavage is a series of extremely rapid mitotic divisions wherein the enormous volume of the zygote cytoplasm is divided into numerous smaller cells.

Question 3

What are the small cells produced by cleavage called

Answer 3

blastomores

Question 4

what is a blastomere

Answer 4

a cell produed by the division of a fertlized egg.

Question 5

what are the outcomes of cleavege

Answer 5

in formation of northpole ( animal ) where the zygote is mostly mechanically active
and the southpole is vegetal pole where the yolk is found.

Question 6

what are the specifics divsions

Answer 6

div 1 and div 2 are meridional -
div 3 first equatorial division
div 4 – Beginning of pattern formation

div 5 -7 Cells form a blastula
div10 - Blastula remains one cell layer thick

Question 7

What are the steps in Gastrulation

Answer 7

• Ingression ( PMC)
• Invagination
• convergent extension
• mouth formation via secondary mesenchyme