If the fate of each blastomere is foretold then what will that cleavage be?
Correct answer: D. Spiral and determinate
- A. Spiral and indeterminate
- B. Radial and determinate
- C. Radial and indeterminate
- D. Spiral and determinate
Explanation
Spiral cleavage means that the planes of cell division are diagonal to the vertical axis of the embryo. Determinate cleavage means that the fate of each embryonic cell is fixed very early. A spiral and determinate cleavage is that in which the lines or planes of cleavage are not symmetrical between poles instead these are diagonal to the polar axis and produce unequal cells around the axis of polarity and all the blastomeres have determined role to play in the formations of embryo. The fate of each blastomere is foretold.
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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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