In Poultry Feathered legs (F) is dominant over clean legs(f) and pea comb(P) is dominant over single comb(p). Two cocks, A and B are bred to two hens C and D. All four birds are featherd legged...

In Poultry Feathered legs (F) is dominant over clean legs(f) and pea comb(P) is dominant over single comb(p). Two cocks, A and B are bred to two hens C and D. All four birds are featherd legged and pea combed. Cock A with both hens produce offsprings that are feathered legged and pea combed. Cock B with hen C produces both feathered legged and clean legged but all pea combed, but with hen D, produces all feathered legged but part pea combed and part single combed offspring. What are the genotype of all these four birds?

Asked on by islnds

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tjbrewer | Elementary School Teacher | (Level 2) Associate Educator

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Since the Hens have offspring with recessive traits with Cock B, they must be hybrids, and thus have the recessive genes.  Since they have no recessive offspring with Cock A, then Cock A must be a purebred, Genotype FF, PP. 

Since Cock B has one of the recessive traits in his offspring with one hen, and the other recessive trait in his offspring with the other hen, he must be hybrid for both traits.  Genotype Ff, Pp

Since Hen C's offspring all had Pea Combs she must be purebred for Pea Combs, but having clean legged offspring means she must be hybrid for feathered legs.  Genotype Ff,PP

Since Hen D's offspring all had feathered legs, she must be purebred for feathered legs, but having single combed offspring means she must be hybrid for a pea comb.  Genotype FF, Pp. 

Cock A: FF, PP  Cock B: Ff, Pp  Hen C: Ff, PP  Hen D: FF, Pp. 

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