Spiral and determinate cleavage is found in the embryo of:
Correct answer: B. Leech
- A. Frog
- B. Leech
- C. Pigeon
- D. Brittle star
Explanation
Explanation: Spiral cleavage is a type of embryonic development in which cells divide at oblique angles, resulting in a helical arrangement. Determinate cleavage means that the fate of each embryonic cell is determined early in development. This pattern is characteristic of many protostomes, such as leeches.
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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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