Literature DB >> 14112709

GYNOGENESIS IN SALAMANDERS RELATED TO AMBYSTOMA JEFFERSONIANUM.

H C MACGREGOR, T M UZZELL.   

Abstract

The oocytes of naturally occurring triploid females of the Ambystoma jeffersonianum complex each contain 84 lampbrush chromosomes. This constitutes hexaploidy (n = 14). The chromosomes are joined into pairs by chiasmata and form 42 bivalents. It is suggested that meiosis in triploid females is preceded by an endomitosis and the resulting sister chromosomes synapse to form pseudo-bivalents. Sperm from diploid males stimulate development of the triploid eggs but do not contribute chromosomes to the triploid nucleus. Bivalents in the oocytes of triploids have twice as many chiasmata as the corresponding bivalents in diploid animals. Such chiasmata cannot result in genetic recombination.

Entities:  

Keywords:  CELL DIVISION; CHROMOSOMES; EXPERIMENTAL LAB STUDY; FERTILIZATION; GENETICS; SALAMANDERS

Mesh：

Year:  1964        PMID： 14112709     DOI： 10.1126/science.143.3610.1043

Source DB:  PubMed          Journal:  Science        ISSN： 0036-8075            Impact factor:   47.728


  26 in total

1.  The organization of genetic diversity in the parthenogenetic lizard Cnemidophorus tesselatus.

Authors:  E D Parker; R K Selander
Journal:  Genetics       Date:  1976-12       Impact factor: 4.562

Review 2.  Evolutionary cytogenetics in salamanders.

Authors:  Stanley K Sessions
Journal:  Chromosome Res       Date:  2008       Impact factor: 5.239

3.  Genealogical relationships of southern Ontario polyploid unisexual salamanders (genus Ambystoma) inferred from intergenomic exchanges and major rDNA cytotypes.

Authors:  Ke Bi; James P Bogart; Jinzhong Fu
Journal:  Chromosome Res       Date:  2008-01-04       Impact factor: 5.239

4.  Premeiotic chromosome doubling after genome elimination during spermatogenesis of the species hybrid Rana esculenta.

Authors:  S Heppich; H G Tunner; J Greilhuber
Journal:  Theor Appl Genet       Date:  1982-06       Impact factor: 5.699

5.  Cytogenetics of the parthenogenetic grasshopper Warramaba (formerly Moraba) virgo and its bisexual relatives. II. Hybridization studies.

Authors:  M J White; N Contreras; J Chency; G C Webb
Journal:  Chromosoma       Date:  1977-05-13       Impact factor: 4.316

6.  Probing the meiotic mechanism of intergenomic exchanges by genomic in situ hybridization on lampbrush chromosomes of unisexual Ambystoma (Amphibia: Caudata).

Authors:  Ke Bi; James P Bogart
Journal:  Chromosome Res       Date:  2010-04-01       Impact factor: 5.239

7.  Mitochondrial genotype of a unisexual salamander of hybrid origin is unrelated to either of its nuclear haplotypes.

Authors:  F Kraus; M M Miyamoto
Journal:  Proc Natl Acad Sci U S A       Date:  1990-03       Impact factor: 11.205

8.  Herbert Macgregor (1933-2018).

Authors:  Joseph G Gall
Journal:  Chromosome Res       Date:  2018-10-01       Impact factor: 5.239

9.  Cytophotometric and autoradiographic evidence for functional apomixis in a gynogenetic fish, Poecilia formosa and its related, triploid unisexuals.

Authors:  E M Rasch; P J Monaco; J S Balsano
Journal:  Histochemistry       Date:  1982

10.  Sister chromosome pairing maintains heterozygosity in parthenogenetic lizards.

Authors:  Aracely A Lutes; William B Neaves; Diana P Baumann; Winfried Wiegraebe; Peter Baumann
Journal:  Nature       Date:  2010-02-21       Impact factor: 49.962
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