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PubMed1959

Chromosomal translocation in domestic fowl induced by x-rays.

The cytological appearance and behavior of an x-ray-induced reciprocal translocation between the first and second chromsome of the domestic fowl is described, and its relevance to the further definition of linkage studies in the fowl is observed.

Animals↗
PubMed1958

Factors limiting the number of radiation-induced chromosome exchanges. I. Distance: evidence from non-interaction of x-ray- and neutron-induced breaks.

Soaked seeds of Vicia faba were exposed to fractionated doses of x-rays or x-rays and fast neutrons. When the two-hit (exchange) chromosome aberrations were scored at the first mitosis of the root tip, it was observed that with short fractionation times the radiation-induced breaks from the two x-ray doses could rejoin with one another to form exchanges in proportion to the square of the total dose. If, however, one dose was x-rays and the second neutrons, then no quantitatively determinable interaction occurred between the breaks induced by each of the doses, and the aberration yield was simply the sum of that induced by each fraction. The phenomenon of non-interaction as observed by these dose fractionation studies and also by the linear dose response curve for two-break aberrations induced by neutrons has led to calculations of the distance over which two breaks can rejoin. The distance is evidently much smaller than the previously accepted value of 1 micro.

Chromosome Aberrations↗