Problem:
Question 1: When does differentiation begin in flowering plants?
a. Prior to fertilization
b. Just after fertilization, but before any cell divisions take place
c. Just after the first cell division
d. At the blastula stage
e. At the globular embryo stage
Question 2: Which axis develops first in animals, anterior-posterior (A-P) or dorsal-ventral (D-V)?
a. A-P
b. D-V
c. They develop at the same time.
d. They are controlled by the same transcription factors at the same time.
Provide the correct answer and justification for your choice.