In an experiment, a cell was isolated from an unknown embryo at four-cell stage and allowed to divide. Even after repeated divisions, this isolated cell did not develop into a complete animal.The embryo used in the above experiment could be of a:
Correct answer: C. Starfish
- A. Frog
- B. Snail
- C. Starfish
- D. Sparrow
Explanation
The correct answer is starfish. In starfish, the embryo exhibits a mosaic development pattern. This means that the fate of each cell is determined early, and if a cell is isolated, it cannot develop into a complete organism. In contrast, embryos of organisms like frogs, snails, and sparrows have regulative development, where cells have the potential to form a complete organism if separated at an early stage. Therefore, the inability of the isolated cell to form a complete animal suggests that the embryo is from a starfish.
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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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