Abstract
A cytogenetic study on four generations of the newt Pleurodeles waltlii has resulted in a stock homozygous for a pericentric inversion in chromosomes no. 6.-The chromosomal rearrangement has first been detected at the heterozygous state in a female resulting from a cross between a normal female and a male treated with X rays. — The rearranged chromosome is very easily recognizable under direct microscopic investigation. The heterozygotes and the homozygotes for the aberration grow normally; thus, the inversion constitutes a nuclear marker which can be readily used.
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