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File:Frog blastula blastocoel.jpg

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Description Fig. 29.—Vertical section through the blastula of a frog in different stages. B, segmentation cavity or blastocoel. (After Marshall.) the subsequent divisions soon become so irregular that it is impossible to trace out any plan of procedure. A fifth cleavage occurs typically parallel to the third, appearing first in the upper hemisphere and then in the lower. The cleavages thus far usually follow the rule that each cleavage plane comes in at right angles to the previous cleavage plane. Deviations from the typical method of cleavage are apparently of little moment, even in the first few divisions, as such abnormally dividing eggs may nevertheless produce perfect embryos.
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Source https://www.flickr.com/photos/internetarchivebookimages/19761573833/in/photostream/ The biology of the frog. New York : The Macmillan company
Author Holmes, Samuel J.

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/19761573833. It was reviewed on 2024-03-11 22:49:36 by FlickreviewR 2, who found it to be licensed under the terms of the cc-zero, which is compatible with the Commons. It is, however, not the same license as given above, and it is unknown whether that license ever was valid.

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current21:35, 10 March 2024Thumbnail for version as of 21:35, 10 March 20242,208 × 1,092 (946 KB)Rasbak (talk | contribs){{Information |description=Fig. 29.—Vertical section through the blastula of a frog in different stages. B, segmentation cavity or blastocoel. (After Marshall.) the subsequent divisions soon become so irregular that it is impossible to trace out any plan of procedure. A fifth cleavage occurs typically parallel to the third, appearing first in the upper hemisphere and then in the lower. The cleavages thus far usually follow the rule that each cleavage plane comes in at right angles to the prev...

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