On the Localization of a Non-Mendelian Gene in Chlamydomonas reinhardii Summary. Transfer of a non-Mendelian neamine-dependent (nd) mutant to an antibioticfree medium results in neamine-sensitive and neamine-resistent revertants. These reversions are caused by extranuclear mutations.The neamine-sensitive revertants are no more able to split off nd-cells after back-donation to neamine containing medium. Therefore they are different from the streptomycin-sensitive revertants of a streptomycin-dependent (sd) mutant. These mutants were capable of sdsegregation though their potence of sd-segregation diminished on antibiotic-free medium with increasing time of cultivation.The different behaviour can be explained by the fact that many sd-genes are present which have to be appointed to the mitochondria. On the other side, the nd-gene exists only in few copies and is located therefore in the chloroplast.Several experiments with differing methods are discussed to localize the extranuclear genes.
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