The following results are ordered tetrad pairs from a cross be-tween strain cc/and strai...

The following results are ordered tetrad pairs from a cross be-tween strain cc/and strain + +:

They are summarized by tetrad classes.

(a) Name the ascus type of each class from 1 to 7 (P, NP, or T).

(b) The data support the conclusion that the c and d loci are linked. State the evidence in support of this conclusion.

(c) Calculate the gene-centromere distance for each locus.

(d) Calculate the distance between the two linked loci.

(e) Draw a chromosome map, including the centromere, and explain the discrepancy between the distances determined by the two different methods in parts (c) and (d).

(f) Describe the arrangement of crossovers needed to produce the ascus class 6.