Question
Cell cleavage type in embryo shown in photograph below is how many celled ?
A. 4.
B. 8.
C. 12.
D. 16.
Show Answer
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Correct Answer » D
Explanation
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- At about 16 cells stage the blastomeres tightly align by the process of compaction to form a compact ball of cells called morula (mulberry).
- This process of compaction leads to segregation of cells into two groups :
- Inner cells (inner cell mass)
- Outer cells (outer cell mass)
- Morula enters uterine cavity 4 days after fertilization
