"Quiglilies" are a rare variety of flower. They have one allele for orange petal colour O. They also have another allele for white petals W. These alleles have a co-dominant relationship producing a yellow petal colour.

Question

i) what are the possible genotypes and phenotypes present in Quiglilies?
ii) After several generations it was noticed that the white allele disappeared from the genome. Explain this observation.