1. Schizosaccharomyces pombe (fission yeast) S. pombe is a species of yeast , also called fission yeast, which is used as a model organism for biological and medical study. They are useful because most of the time they are haploid so that both recessive and dominant mutation s in the genome will result in a mutant phenotype (since each individual yeast cell has only one copy of each gene , unlike in diploid organisms where a normal copy of a gene can make up for recessive mutations, resulting in mutant phenotypes only for dominant mutations).
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