Here the event can occur in either of 2 ways. Here probability is conditional. Co-dominance applies to gene products at the molecular level where each allele controls the production of about half the product in the cell. Hemoglobin variants and ABO antigens are good examples. Incomplete dominance occurs at the organismal level when the heterozygote's phenotype is intermediate between the two homozygotes.
Platinum is a dominant visible and recessive lethal.
O is recessive to both. Again, this notation is not proper and should have superscripts. Use Cn c as parent. 2 C - x cc produces full Cc. Cross 2 CCh x cc produces Himalayan Chc.