In Neurospora,a,b,and C Are Auxotrophic Mutants (Require Particular Compounds for Growth).The

Multiple Choice

In Neurospora,a,b,and c are auxotrophic mutants (require particular compounds for growth) .The mating a b⁺ *a⁺b gives 5% prototrophs (grown on unsupplemented medium) .The mating b⁺c * b c⁺ gives 2.5% prototrophs,and the mating a⁺c * a c⁺ gives 2.5% prototrophs.Assuming complete interference prevails in the chromosome segment in question,what percent of prototrophs would you expect in the mating a⁺b c⁺ * a b⁺c? (The order of mutations is not necessarily a,b,c: It can be determined on the basis of the two-point crosses above.)

A) 0%
B) 0.0625%
C) 0.125%
D) 2.5%
E) 5%