Question
Differentiate between morula and blastocyst as stages in human embryonic development. Which of these stages gets implanted in the uterine wall and about how many days after fertilization?
✓
Answer
|
S. No.
|
Morula
|
Blastocyst
|
|
1.
|
It is a solid sphere of 8-16 blastomeres.
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It contains about 64 cells and hollow inside due to the development of blastocoel cavity.
|
|
2.
|
Zona-pellucida remains intact
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As the blastocyst enlarges, zona pellucida disintegrates. Blastocyst gets implanted after 7 days of fertilization.
|
Blastocyst gets implanted after 7 days of fertilization.
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