For a Pure Culture of Saccharomyces Cerevisiae Cells That Were

Multiple Choice

For a pure culture of Saccharomyces cerevisiae cells that were all derived from a single cell to mate,

A) a mating-type switch in one or more cells in the culture must occur.
B) both the α and the a gene must be fully expressed in the population.
C) the α gene must be fully repressed in the population.
D) some cells must exist as diploids.