Question: The red and white feather pattern of a bird is determined by a gene that has two alleles, band R and W,which show codominance. Some birds have completely red feathers (RR),some parrots have completely white feathers (WW), and others have red and white feathers (RW).In a population of 630 birds that is at Hardy-Weinberg equilibrium, 202 parrots have completely red feathers. How many birds in this population would be expected to have either red or white feathers?
Is this question asking for what is the carrier proportion-2pq? The answer is supposed to be 321 but I keep getting 309. I did 202/630= p^2=0.32= 0.566. Then q=1-0.566 =0.434. Then I did 2(0.434)(0.5662)= 0.49. Then I multiplied 0.49 x 630 to get 309. If any one can point out what I did wrong I would really appreciate it!!