Indicate the percentage of tetrads that would have 0, 1, 2, 3, or 4 viable spores after saccharomyces cerevisae a /α diploids of the following genotypes are sporulated: (a)- a true-breeding wild-type strain (with no mutations in any gene essential for viability). (b)- a strain heterozygous for a null (completely inactivating) mutation in a single essential gene. for the remaining parts of this problem, consider crosses between yeast strains of the form a x b, where a and b are both temperature-sensitive mutations in different essential genes. the cross is conducted under permissive (low-temperature) conditions. indicate the percentage of tetrads that would have 0, 1, 2, 3, or 4 viable spores subsequently measured under restrictive (high-temperature) conditions. (c) a and b are unlinked, and both are 0 m. u. from their respective centromeres. (d)- a and b are unlinked; a is 0 m. u. from its centromere, while b is 10 m. u. from its centromere. (e)- a and bare 0 m. u. apart. (f)- a and b are 10 m. u. apart. assume all crossovers between a and b are scos (single crossovers). (g)- in part (f), if a four-strand dco (double crossover) occurred between a and b, how many of the spores in the resulting tetrad would be viable at high temperature?