THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES

1. This paper presents cytological observations upon Dr. Loeb's parthenogenetic frog material, with considerations upon the mechanism by which the diploid number and both sexes may be produced. 2. Both sexes of adults and tadpoles are present. 3. The chromosome number is diploid and probably 2...

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Main Author:	Parmenter, Charles L.
Format:	Online
Language:	English
Published:	The Rockefeller University Press 1925
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2140755/

id	pubmed-2140755
recordtype	oai_dc
spelling	pubmed-21407552008-04-23 THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES Parmenter, Charles L. Article 1. This paper presents cytological observations upon Dr. Loeb's parthenogenetic frog material, with considerations upon the mechanism by which the diploid number and both sexes may be produced. 2. Both sexes of adults and tadpoles are present. 3. The chromosome number is diploid and probably 26 in both sexes. Sex chromosomes cannot be distinguished. 4. The chromosome numbers observed by other authors in parthenogenetic frog material are haploid, diploid, and variable. Their significance is considered. 5. The mechanism producing the diploid number, based on European observations, appears to be a doubling of the haploid number at some time after the second polar body is given off. 6. Overripeness may be a factor in producing both sexes of parthenogenetic frogs and tadpoles. 7. Genetic data indicate that the normal male is digametic and that there are differences of potency between male and female factors for sex which vary in frogs of the two races and in strains within the race. These differences have been interpreted by Witschi as forming a series of multiple allelomorphs. The Rockefeller University Press 1925-09-18 /pmc/articles/PMC2140755/ /pubmed/19872182 Text en Copyright © Copyright, 1925, by The Rockefeller Institute for Medical Research This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Parmenter, Charles L.
spellingShingle	Parmenter, Charles L. THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
author_facet	Parmenter, Charles L.
author_sort	Parmenter, Charles L.
title	THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
title_short	THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
title_full	THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
title_fullStr	THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
title_full_unstemmed	THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES
title_sort	chromosomes of parthenogenetic frogs and tadpoles
description	1. This paper presents cytological observations upon Dr. Loeb's parthenogenetic frog material, with considerations upon the mechanism by which the diploid number and both sexes may be produced. 2. Both sexes of adults and tadpoles are present. 3. The chromosome number is diploid and probably 26 in both sexes. Sex chromosomes cannot be distinguished. 4. The chromosome numbers observed by other authors in parthenogenetic frog material are haploid, diploid, and variable. Their significance is considered. 5. The mechanism producing the diploid number, based on European observations, appears to be a doubling of the haploid number at some time after the second polar body is given off. 6. Overripeness may be a factor in producing both sexes of parthenogenetic frogs and tadpoles. 7. Genetic data indicate that the normal male is digametic and that there are differences of potency between male and female factors for sex which vary in frogs of the two races and in strains within the race. These differences have been interpreted by Witschi as forming a series of multiple allelomorphs.
publisher	The Rockefeller University Press
publishDate	1925
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2140755/
_version_	1611422405230592000

THE CHROMOSOMES OF PARTHENOGENETIC FROGS AND TADPOLES

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