#Question id: 5550
#Unit 5. Developmental Biology
The vertebrate nervous system is derived from
#Question id: 5551
#Unit 5. Developmental Biology
When the vertebrate embryo grows into a hollow ball, it is called a
#Question id: 5552
#Unit 5. Developmental Biology
Soon after gastrulation, dorsal ectodermal cells condense and form a tube called the _______________ tube.
#Question id: 5553
#Unit 5. Developmental Biology
The notochord is a ___ structure in vertebrate embryos that lies under the ___, and is bordered by ___.
#Question id: 5555
#Unit 5. Developmental Biology
The formation of the fertilization envelope requires an increase in the cytosolic concentration of ________.
#Question id: 5556
#Unit 5. Developmental Biology
Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.