Multiple choice

The grey crescent region marks the position of:

  1. dorsal lip of blastopore

  2. lateral lips of blastopore

  3. ventral lip of blastopore

  4. all of the above
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A Correct answer
Explanation

The grey crescent is a pigmented region opposite the sperm entry point in amphibian zygotes. It marks the future dorsal side and specifically corresponds to the region where the dorsal lip of the blastopore will form during gastrulation. This area contains important organizational factors that establish the embryonic body axis.

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