Chloroplast Genetics of Chlamydomonas. I. Allelic Segregation Ratios

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This paper presents allelic segregation data from a series of 16 crosses segregated for nuclear and chloroplast genes. By means of pedigree analysis, segregants of chloroplast markers occurring in the zygote have been distinguished from those occurring in zoospore clones. The genes ac1, ac2, and tm1 showed little if any deviation from 1:1 either in zygotic segregation or in zoospore clones. The genes sm2, ery, and spc showed a significant excess of the allele from the mt + parent in zygotes. However, in zoospores, mt + excess was seen only when that allele was the mutant (resistant) form but not when it was wild type (sensitive).

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