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    I am given the following information about Combs of domestic chicken:

    Four comb shapes in domestic chickens are Single, Rose, Walnut & Pea. Two gene loci P/p, and R/r interact to affect comb shape. The affect of P/p depends on which of the R/r alleles are present in the bird's genotype.

    P-R- = Walnut Comb
    ppR- = Rose comb
    P-rr = Pea comb
    pprr = Single Comb

    Q. Which two genotypes should a poultry breeder cross to produce chickens with 25% of each genotype?

    Thanks
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    PpRr x pprr

    or

    Pprr x ppRr

    you can try to do the full genetic diagram of these crosses.
 
 
 
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