I read your post, and was delighted with the info, though, i was not able to figure out your R's and numbers. Homozygous, means that the organism carries 2 dominant genes for a trait, while Heterozygous means that the organism presents the trait, while carrying a recessive gene, right??? So are the R1 and R2 both required to produce a rose comb? I think after reading through all of your R's, r's and 1's and 2's again, I'm wrapping my head around it. I need a teacher. Ignore the snide. Us geeks need to stick together and feed the need. Does this info translate into breeding info for crossing pea and rose???Phew, after the snide comments yesterday directed at me and also the general BYC-er, I was beginning to wonde if the love of learning was absent in poultry owners. I posted an interesting (to me) article on rose comb genetics a week or so ago. Two genes for rose comb, R1 and R2. Homozygous R1 can lower fertility in roosters, , R1R2, R1r and R2r (r is wild type single comb) roosters are normal.
How does this belong in a thread on linebreeding? Linebreeding doesn't add genes, so if you started off with an R1r rooster eventually you may end up with single comb and possibly a reduced fertility rooster. Reduced fertility might not be noticable in a backyard flock or small set up.
But two genes for what was originally (long long ago) a mutation? Awesome