Two Strains of S

Multiple Choice

Two strains of S.cerevisae (yeast) are crossed.One has the genotype ABC and the other abc.Five sets of the resultant tetrads are noted below.In which set did a gene conversion event occur?

A) abc, aBc, AbC, aBC
B) abc, abc, ABC, ABC
C) aBc, aBc, AbC, AbC
D) abC, abc, ABc, ABC
E) Abc, Abc, aBC, aBC