Multiple choice

Which among the following statements regarding the blastula stage is incorrect?

  1. The blastocyst contains an embryoblast.

  2. The blastula stage of early embryo development begins with the appearance of the blastocoele.

  3. In the mammalian blastocyst, there are numerous lineages that give rise to later tissue development.

  4. Mammalian embryos undergo compaction around the 8-cell stage.

  5. The tight junctions arise after the polarity of epithelial cells is established.
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C Correct answer
Explanation

In the mammalian blastocyst, there are three lineages that give rise to later tissue development. The epiblast gives rise to the fetus itself while the trophoblast develops into part of the placenta and the primitive endoderm becomes the yolk sac.

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