Chromosomes in yeasts

Abstract

Centrosomes and chromosomes were described in our control strain of yeast some four years ago. At that time we had to depend on camera lucida illustrations, owing to lack of facilities for photomicrography. Winge and Roberts, while agreeing with our criticisms of Lindegren's views on yeast cytology, comment: "The experience of the senior author in searching for the difficultly observable chromosomes in yeasts have not led to a resumption of cytological investigations". In a recent publication, they dispute our claim of induction of polyploidy and state that technical difficulties should have precluded satisfactory chromosome counts. Lindegren and Rafalko, on the other hand, try to interpret the bodies identified by us as chromosomes as centrioles, but do not extend it to the bodies identified by us as the centrioles.