Chromosomes in Yeasts

Abstract

CENTROSOMES and chromosomes were described in our control strain of yeast some four years ago¹. At that time we had to depend on camera lucida illustrations, owing to lack of facilities for photomicrography. Winge and Roberts², while agreeing with our criticisms of Lindegren's³ 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, they⁴ dispute our claim of induction of polyploidy and state that technical difficulties should have precluded satisfactory chromosome counts. Lindegren and Rafalko⁵, 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.