Ch. 8 Vocab

Question 1

What is Preformation?

Answer 1

i. Miniature adult present in sperm/egg
ii. Discredited

Question 2

What is Epigenesis?

Answer 2

i. Fertilized egg contains building materials ii. Will be assembled during development

Question 3

What is Development?

Answer 3

i. Series of progressive changes in individual
ii. Usually begins as fertilized egg divides (mitosis)
iii. Cell specialization emerges in hierarchy of developmental “decisions”
Usually irreversible process

Question 4

What is Cleavage

Answer 4

i. Embryo divides repeatedly
ii. Large cytoplasmic mass converted into small maneuverable cells,
blastomeres

Question 5

What is Blastula ?

Answer 5

Cleavage creates cluster of cells (hundreds to several thousand)

Question 6

What is Blastocoel ?

Answer 6

Cavity inside the hollow blastula