Genetic analysis of mating locus linked mutations in Chlamydomonas reinhardii.
The mating-type (mt) locus of Chlamydomonas reinhardii has been analyzed using four mutant strains (imp-1, imp-10, imp-11 and imp-12). All have been shown, or are shown here, to carry mutations linked to either the plus (mt+) or the minus (mt-) locus, and their behavior in complementation tests has allowed us to define several distinct functions for each locus. Specifically, we propose that the mt+ locus contains the following genes or regulatory elements: a locus designated sfu, which is necessary for sexual fusion between gametes; a locus designated upp (uniparental plus), which controls aspects of chloroplast gene inheritance and perhaps also zygote maturation; and a locus designated sad, which functions in sexual adhesion. The mt- locus also contains a sad locus as well as a gene or regulatory element designated mid, which is necessary for the minus dominance in mt+/mt- diploids.
D000483:Alleles; D002696:Chlamydomonas / Q000235:genetics*; D003433:Crosses, Genetic; D005787:Gene Frequency; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D008040:Genetic Linkage; D005838:Genotype; D009154:Mutation; D013045:Species Specificity