The transitory stage between cleavage and gastrulation is:
Correct answer: B. Blastula
- A. Orgenogenesis
- B. Blastula
- C. Gastrula
- D. Development
Explanation
Zygote develops by a sequence of mitotic division, called cleavage, into a multicellular structure, first a solid ball of cells the module, and then a hollow ball of cells the blastula.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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About Embryonic Development
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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