The Primary Organizer

Question 1

the primary organizer is the _____

Answer 1

dorsal lip of the blastopore

Question 2

the primary organizers also the first ______

Answer 2

inducer

Question 3

the primary organizer which is the dorsal lip of the blastopore is also the primary inducer which subsequently triggers a cascade of ______ reactions

Answer 3

induction

Question 4

the primary organizer which is the primary inducer which subsequently triggers a cascade of induction reactions eventually results in the formation of the ______ shape

Answer 4

embryonic

Question 5

true or false
once neurulation has happened, other events follow

Answer 5

True

Question 6

true or false
in transplantation experiments, the dorsal lip of the blastopore (the region fated to give rise to dorsal mesoderm) not only did not change fate when transplanted, but induced surrounding host cells to change their fate

Answer 6

True

Question 7

The dorsal lip of the blastopore is the _______

Answer 7

the region fated to give rise to dorsal mesoderm

Question 8

if we remove a _______ (chordamesoderm) and transferred to other side of embryo: it will organize another dorsal lip

Answer 8

presumptive notochord

Question 9

conjoined twins happens because of______

Answer 9

extra primary organizer

Question 10

Conjoined twins
- rescue of irradiated embryos plantation of dorsal marginal cells of normal ______ embryos

Answer 10

32-cell

Question 11

Conjoined twins

true or false
without such a rescue irritated embryos gastrulate successfully, forming “belly pieces”

Answer 11

False (will fail to gastrulate, hence forming belly pieces)

Question 12

if the dorsal marginal zone cells of a normal embryo are transplanted into the irradiated embryo, they will induce the _______ thereby producing a normal tadpole

• irradiate blastopore lip

Answer 12

formation of mesoderm and the body axis