Quote[/b] (Pyro @ Jan. 18 2006,12:39)]2 GFP pigs will sire all GFP offspring. 1 GFP pig and one normal pig will either give rise to 50% GFP offspring and 50% normal offspring or 100% carrier offspring depending on the heritability trait (i.e. whether you need 1 copy of the gene for GFP fluorescence or 2 copies)
As for what glows, since every cell has the gene then every cell produces the protein so pretty much everything glows on them. However, it is not always visable. I know on the monkey, due to his skin pigmentation, only his eyes, the tips of his hair and nailbeds would fluoresce.