Question: There are two genes coding for beak color in peacocks. The R allele confers an orange beak, while r codes for a red beak. At a separate locus, the Spread gene, S allows the alleles at the Red locus to be expressed while s is a recessive epistatic allele and causes the beak to be white. A cross between a two birds of unknown beak color results in 20 offspring; 5 with orange beaks, 5 with red beaks, and 10 with white beaks.
What are the phenotypes and genotypes of the parent birds?