Butterflies are typical diploid eukaryotes with the following inherited conditions:
Crossveins (c+) vs no crossveins (c)
Spots (s+) vs no spots (s)
Orange colour (o+) vs cream (o)
True-breeding c s o are crossed to c+ s+ o+ to produce F1 progeny that are all phenotypically c+ s+ o+. The F1 progeny are mated in a test cross to homozygous cc ss oo butterflies. The F2 offspring are as follows:
a. How are the genes transmitted (linked, unlinked, etc.)?
b. Determine the map distance between any linked genes.