Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 31 March 1972:
Vol. 175. no. 4029, pp. 1484 - 1486
DOI: 10.1126/science.175.4029.1484
Prev | Table of Contents | Next

Articles

Meiosis in Triploid All-Female Fish (Poeciliopsis, Poeciliidae)

Michael C. Cimino 1

1 Ecology Section, Biological Sciences Group, University of Connecticut, Storrs 06268

Prior to meiosis in triploid gynogenetic all-female forms of Poeciliopsis, the chromosome number of the nucleus of the triploid oogonium is raised endomitotically to hexaploid. Recombination does not occur; instead, a triploid ovum with a genetic complement identical to that of the mother is produced by two conventional meiotic divisions. Sperm from a sympatric gonochoristic (bisexual) species stimulates the ovum to develop, but paternal genes are not incorporated into the zygote. This is the first cytologically verified case of natural endomitosis in the egg production in fish.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Chromosome Doubling in Early Spermatogonia Produces Diploid Spermatozoa in a Natural Clonal Fish.
H. Yoshikawa, K. Morishima, T. Fujimoto, T. Saito, T. Kobayashi, E. Yamaha, and K. Arai (2009)
Biol Reprod 80, 973-979
   Abstract »    Full Text »    PDF »
Microtubule distribution during meiosis I in flea-beetle [Alagoasa (Oedionychus)] spermatocytes: evidence for direct connections between unpaired sex chromosomes.
P. J. Wilson, A. Forer, and D. Wise (2003)
J. Cell Sci. 116, 1235-1247
   Abstract »    Full Text »    PDF »
Evidence for biased gene conversion in concerted evolution of ribosomal DNA.
D. Hillis, C Moritz, C. Porter, and R. Baker (1991)
Science 251, 308-310
   Abstract »    PDF »
Coexistence of Clones in a Heterogeneous Environment.
R. C. VRIJENHOEK (1978)
Science 199, 549-552
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)