What comb type is this?

[Chicicki]

View attachment 4305897

 

[Chicicki]

View attachment 4305897

 

[Cloverr39]

Looks like a walnut comb to me

 

[Chicicki]

Looks like a walnut comb to me

When I cross her with a single combed rooster I mostly get single combed chicks though

 

[Cloverr39]

When I cross her with a single combed rooster I mostly get single combed chicks though

Single comb is recessive to walnut, so she likely carries the genes needed to pass single comb down to her chicks.

 

[RoostersAreAwesome]

When I cross her with a single combed rooster I mostly get single combed chicks though

Do you have pictures of her offspring?

 

[Otcho]

When I cross her with a single combed rooster I mostly get single combed chicks though

This is possible because of the loci (plural of locus) involved in chicken comb shapes. Both the rose comb locus (r+/r+, R/r+, or R/R) and the pea comb locus (p+/p+, P/p+, or P/P) determine what type of comb is expressed.

Single Comb, the wildtype version of this gene, is written r+/r+ p+/p+ or rrpp, meaning that neither the Rose Comb mutation (R) nor the Pea Comb mutation (P) are present.

Rose Combed birds have one or more copies of the Rose Comb mutation (R). They can be either R/R (RRpp) or R/r+ (Rrpp). This can also be written R_pp, with the underscore behaving like an unknown "x" variable in algebra.

Pea Combed birds have one or more copies of the Pea Comb mutation (P). They can be either P/P (rrPP) or P/p+ (rrPp). Alternatively, the Pea Comb genotype can be written rrP_.

If both the Rose Comb and Pea Comb mutations are present, then the bird will have a Walnut Comb. The Walnut Comb genotype can be RRPP, RrPP, RRPp, or RrPp. Including the underscore, the Walnut Comb genotype can be written R_P_.

Because Walnut Combed birds like yours can have only one copy of the Rose and Pea Comb mutations (i.e., RrPp), there's a chance that they pass neither onto their offspring.

For example, a Walnut Combed (RrPp) x Single Combed (rrpp) cross would produce 25% RrPp (Walnut Combed), 25% Rrpp (Rose Combed), 25% rrPp (Pea Combed), and 25% rrpp (Single Combed) offspring.

When I need to calculate crosses with multiple traits, I use a Punnett Square calculator like this one