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Yeast strains have two mating types MATa (since it secretes a pheromone named 'a factor'), MATα (secretes pheromone 'α factor'). Both MATa and MATα strains are haploid and when they fuse together they form diploid zygote. A haploid yeast has only one set of genes and utilize chemicals like histidine and tryptophan (amino acids) and adenine (part of DNA, ATP ...



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