What stage of preembryonic development results in a solid ball of nearly identical cells?
A) zygote
B) blastomere
C) blastocyst
D) morula

Question

Quizplus · Accepted Answer

The stage of preembryonic development that results in a solid ball of nearly identical cells is the morula stage. At this stage, the zygote has undergone several rounds of mitotic division and has developed into a ball of approximately 16-32 cells, with no differentiation between the cells yet. The other options are not correct because: 
- A) zygote is the first stage of development after fertilization, when the sperm and egg fuse to form a single cell. 
- B) blastomere refers to any of the cells produced by the early divisions of the zygote. 
- C) blastocyst is a later stage of development, when the morula has developed a fluid-filled cavity called the blastocoel and differentiated into two types of cells: the inner cell mass and the trophoblast.

What Stage of Preembryonic Development Results in a Solid Ball