Hey guys can anybody please help me with this inheritance question im stuck on. The question reads:"In breeding experiments, moths whose wings were black with small white marks near the wing tips were crossed with moths whose wings were grey and had no white marks near the wing tips. The offspring all had black wings with no white markings, assuming the genes for wing colour and wing markings are carried on separate chromosomes, choose appropriate symbols and construct a genetic diagram to explain the outcome of this cross"
I then have to pick letters for alleles for wing markings, no wing markings, and black wings and red wings, then state parental phenotypes, genotypes and gametes. Along with F1 gametes. Any help would be appreciated, im so confused thanks.