Problem:
Dominant mutation (Sb) in the Sb+ gene results in flies with stubble bristles.
A dominant mutation (Ser) in the Ser+ gene results in flies with serrated wings.
Stubble-bristled flies with normal wings are mated to flies with normal bristles, but serrated wings.
Both Sb+ and Ser+ loci are on the third chromosome.
You perform a SELF-CROSS of flies that carry BOTH the dominant mutations and find that all their progeny look like their parents (have stubble-bristles AND serrated wings).
Required:
Question: What is the most plausible explanation of this observation? If linkage is involved how are they linked (chromosome cis/trans)?
So could someone explain this to me?