File:EB1911 Cytology - maturation divisions (2).jpg

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Description

English: Maturation divisions: origin of the tetrads by ring formation in the spermatogenesis of the mole-cricket (Gryllotalpa) (vom Rath). a, primary spermatocyte with six split, bivalent chromosomes. b and c, Split has opened out. d, concentration of the chromatin has made visible the belated transverse division. e and f, grouping of the completed tetrads in the equatorial plate of the first maturation division.

Date

published 1911

Source

Encyclopædia Britannica (11th ed.), v. 7, 1911, “Cytology,” p. 718, fig. 11.

Author

From E. B. Wilson, The Cell in Development and Inheritance

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:31, 28 January 2017		800 × 715 (140 KB)	Bob Burkhardt	{{Information \|Description ={{en\|1=Maturation divisions: origin of the tetrads by ring formation in the spermatogenesis of the mole-cricket (''Gryllotalpa'') (vom Rath). ''a'', primary spermatocyte with six split, bivalent chromosomes. ''b'' and ''c...

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