From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?
A) gastrulation → organogenesis → cleavage
B) ovulation → gastrulation → fertilization
C) cleavage → gastrulation → organogenesis
D) gastrulation → blastulation → neurulation
E) preformation → morphogenesis → neurulation

Question

Quizplus · Accepted Answer

The overall sequence of early development proceeds in the following order: cleavage (division of cells), gastrulation (formation of germ layers), and organogenesis (development of organs and systems). Preformation is an outdated theory of development, and ovulation and fertilization occur before the three stages mentioned in the answer choices. Blastulation, the formation of the blastula, occurs during cleavage, and neurulation occurs during organogenesis.

From Earliest to Latest, the Overall Sequence of Early Development