Parasitic nature of extra fragment chromosomes

Östergren G.,  Botaniska Notiser,  2:157-163. 1945.

This paper is intended as a contribution to the discussion con­cerning the significance of the extra fragments or »accessory chromo­somes» as they are called by Håkansson(1945), which are not too rarely found in cross-fertilizing populations. I think reasonable support may he given to the view that in many cases these chromosomes have no useful function at all to the species carrying them, but that they often lead an exclusively parasitic existence.