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a Zygosis in Chlamydomonas. Two gametes, one of the plus mating type (upper) and one of the minus mating type (lower) fuse, ultimately forming a zygospore. bGSP1 mutants fail to complete zygosis. After fusion with a minus gamete, GSP1 mutant cells fail to limit mitochondrial and chloroplast inheritance in the normal fashion and do not differentiate into zygospores, resulting in vegetative diploid cells containing organelle genomes from both parents
