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#Question id: 5088


 If gastrulation was blocked by an environmental toxin, then ________.

#5. Developmental Biology
  1. cleavage would not occur in the zygote

  2. embryonic germ layers would not form

  3. the blastula would not be formed

  4. the blastopore would form above the gray crescent in the animal pole


Answer:- Option(s): 2


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