Stages of Animal Development

Question 1

Formation of gametes
Can be either spermatogenesis or oogenesis

Answer 1

Gametogenesis

Question 2

It is the union of an ovum and a spermatozoon and results in a unicellular diploid zygote

Answer 2

Fertilization

Question 3

involves a series of mitotic divisions to produce a multicellular blastula from a unicellular zygote

Answer 3

Cleavage

Question 4

[CLEAVAGE] begins with the zygote and ends with the _____

Answer 4

blastocyst

Question 5

formation of three germ layers: ectoderm, mesoderm, and endoderm. Each will give rise to specific tissues and organs.

Answer 5

Gastrulation

Question 6

the fates of the cells are beginning to be determined. The cells started as totipotent in cleavage, but as the cells are moved around through morphogenetic movements, they become more specialized in terms of their fates as they get assigned to specific germ layers.

Answer 6

Gastrulation

Question 7

Nervous system (brain and spinal cord), epidermis, sense organs

Answer 7

Ectoderm

Question 8

muscles, bones, cartilage, circulatory, excretory, and reproductive organs

Answer 8

Mesoderm

Question 9

digestive and respiratory organs, endocrine glands, germ
cells and gametes

Answer 9

Endoderm

Question 10

Show fates of each germ layer in a typical vertebrate animal

Answer 10

Organogenesis