Use the Diagram of Six Loci on a Chromosome to Answer

Multiple Choice

Use the diagram of six loci on a chromosome to answer the question. Locus Y is six map units from Locus X.
When attempting to map the location of Gene Q, relative to Locus Y and Locus Y, two testcrosses were performed and the following data collected.
Number of offspring

These data narrow the possible location of Gene Q to which of the following choices?

A) Locus # only
B) Locus $ only
C) Locus # or Locus *
D) Locus $ or Locus @