Recessive/Dominant traits

Frizzle is actually an incomplete dominant trait, so some Ff (heterozygous dominant/recessive gene) birds will not actually show the frizzle. There are apparently some other genes that interfere with the expression of the frizzle gene.

It is not recommended that you breed for FF (homozygous dominant), as they have poor feather quality (wire feathered) and can have abnormalities of the internal organs, such and enlarged hearts and GI tract problems.

To get frizzles, you breed a Ff frizzle to a ff non-frizzle. You should get about 50% frizzle Ff, and 50% non-frizzle ff, depending on how the genetic dice fall.
 
Silkiness is recessive. The gene symbol is h for hookless; in normal feathers, the barbules have a velcro-like hook that holds them together ; silkie feathers lack this hook. Silkiness is h/h; if a bird does not have two copies of the gene, it will not be apparent.

Frizzled feathers are incompletely dominant; a bird with two copies, FF has overly curled feathers that are usually quite brittle; these birds are usually referred to as curlies. A bird who is F/f+ is the typical frizzle.

For a more complete lit of genes and their dominance see http://www.edelras.nl/chickengenetics/mutations3.html
in Storey's Guide to Raising Chickens it has a short list of dominant and recessive traits:

DOMINANT:
5 toes
feathered legs
crest
side sprigs
frizzledness

RECESSIVE:
4 toes
stubs
single comb
wry tail
silkiness

I was surprised silkiness was on the recessive list. So are all silkies carrying the silkies gene ss? and frizzles are Ff or FF? Calling all silkie breeders!

Also do you guys and girls know any more dominant or recessive traits?
 
The terms "dominant" and "recessive" are not absolute, but relative. When someone asks "which traits are dominant and which are recessive?" we must first know "dominant or recessive to what?"

There are cases where multiple traits are carried as alleles -- different forms of the same gene. In these cases, A could be dominant to B, which is dominant to C, which is dominant to D, etc. And it follows that D is recessive to C, which is recessive to B, which is recessive to A. In such a case, B and C are both dominant and recessive -- it depends on "to what?"

In general, "wild-type" is considered the baseline, and traits are measured against that when characterized as being "dominant" or "recessive", but again, that is describing a relationship between two traits, not an absolute characterization of a single trait.

:)
 

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