Egg to Organism

Question 1

Gastrulation

Answer 1

Primate streak forms, extending towards primitive node, these move towards buccopharygeal membrane of blastocyst

Question 2

3 germ layers

Answer 2

Epiblast splits into ectoderm, endoderm, and mesoderm

Question 3

Neurulation

Answer 3

Ectoderm induced to neuroderm, creating neural plate which expands rapidly and begins to fold in on itself until the neural tube is formed (creating CNS)

Question 4

Closure of neural tube creates…

Answer 4

Body axis (mouth end and anal end)

Question 5

Lateral plate folding

Answer 5

Endoderm splits off and the enclosed section becomes the wall of the gut, this folding creates the 3D embryo who’s structure is widely known

Question 6

Phylotypic stage

Answer 6

Stage where most animal embryos look the same

Question 7

Hox genes

Answer 7

Control development, activated by retinoids acid (vitamin A)

Question 8

Segments and Hox genes

Answer 8

Particular Hox genes specify different regions of the embryo