The following tetrads were produced by a cross of a Neurospora strain that had white spores (w) and a nutritional requirement for the amino acid arginine (arg) with a strain that had dark spores and no arginine requirement:

(a) What is the map distance between the arg locus and the centromere?
(b) What is the map distance between the w and arg loci?
(c) Are the arg and w loci found on the same or different arms of the chromosome?

Transcribed Image Text:

Tetrads Spore Pairs 1 5 6 2 3 4 1-2 w arg warg warg warg w+ 3-4 + arg ++ w arg w+ 5-6 + arg +arg w arg ++ + arg ++ 7-8 ++ ++ w+ w+ + arg +arg No. 58 14 15 2 1 10 Total = 100