Hey Wynette,
I can see how there might be misunderstandings from the progression of posts on yellow skin.
The term "recessive for" in most of the posts should read "heterozygous for".
Heterozygous recessive means the gene is hiding.
If it is test mated to prove that a particular bird is not heterozygous for recessive yellow skin (it would be W+/W+ or homozygous white skin) then that particular birds offspring will not get yellow skin genes. Heterozygous recessive is (W+/w) - these are the sneaky ones that hide the gene and pass it on. The offspring that show yellow skin are w/w, or homozygous recessive.
Ok ... now I'm completely confused!
