A diploid yeast cell was sporulated and dissected. All of the resulting four spores from each ascus.

A diploid yeast cell was sporulated and dissected. All of the resulting four spores from each ascus were fertile while germinating and while at the single cell stage. Upon separation of the cells and further growth, fertility was lost. What could be going on? Devise a mechanism of chromosome marking that would permit only one of the eight great granddaughters of a cell to switch its mating type.

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