In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:

  1. 3 : 1 : 1 : 3
  2. 1 : 1: 1 : 1
  3. 9 : 3 : 3 : 1
  4. 12 : 3 : 4
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