Access

You are not currently logged in.

Access JSTOR through your library or other institution:

login

Log in through your institution.

Journal Article

Cytological Basis of "Sex Ratio" in Drosophila pseudoobscura

E. Novitski, W. J. Peacock and J. Engel
Science
New Series, Vol. 148, No. 3669 (Apr. 23, 1965), pp. 516-517
Stable URL: http://www.jstor.org/stable/1715729
Page Count: 2
  • More info
  • Add to My Lists
  • Cite this Item
Preview not available
Preview not available

Abstract

Cytological investigations of both laboratory and wild "sex ratio" lines of Drosophila pseudoobscura reveal that, contrary to earlier reports, no extra replication of the X chromosome occurs in primary spermatocytes. Normal disjunction of the sex chromosomes at anaphase I leads to equal numbers of X-bearing and Y-bearing secondary spermatocytes. In the latter, the Y chromosome regularly shows a "degeneration" at second anaphase. The "sex ratio" effect can be explained in terms of regularly nonfunctional products of meiosis.

Page Thumbnails

  • Thumbnail: Page 
516
    516
  • Thumbnail: Page 
517
    517