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The idiochromosomes of an earwig, Labidura riparia
Author(s) -
Asana J. J.,
Makino Sajiro
Publication year - 1934
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050560209
Subject(s) - biology , autosome , ploidy , genetics , chromosome , x chromosome , evolutionary biology , zoology , gene
The diploid number of chromosomes of a species of Indian earwigs, Labidura riparia, is fourteen; six pairs of autosomes with X and Y idiochromosomes for the male; six pairs of autosomes with X and X for the female. The chromosome distribution is normal, and constant for all the individuals studied. X and Y are derived from a single chromatin nucleolus of the early growth period which assumes a clavate form later, and remains in the same form till the metaphase of the primary spermatocyte is reached.