CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Chromosomes of the Genus Peromyscus (Deer Mouse)
J. C. Cross
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JOURNAL FREE ACCESS

1938 Volume 8 Issue 3-4 Pages 408-419

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Abstract

All the species of Peromyscus so far studied except P. eremicus have 48 chromosomes. One subspecies of P maniculatus was found with 52 chromosomes. Evidence is found supporting Painter's base number 48 for mammals, but no explanation is offered for the 58 chromosomes found in P eremicus.
Evidence is found in favor of fragmentation as a method for increasing chromosome numbers within a species. This process may be in progress in P maniculatus at the present time.
Almost complete harmony is found between the results of the breeding tests made by Dice and the results of the cytological study made here.
A suggested relationship between various species of Peromyscus is offered based upon cytological evidence.

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© The Japan Mendel Society
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