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The big weird ones are usually heterozygotes. The small, tidy ones are usually homozygotes. You can also look at the wattles, because homozygous pea comb reduces wattle size quite a bit. (Does not work on birds with beards, because beards also reduce wattle size.) Sorry, it won't really help...

So you want a simple explanation of why this is wrong: "Yes, you can get some green eggs from crossing the F1s. "If the F1 hen gives the genes for brown, and the F1 rooster gives the gene for blue, you will get some daughters that lay green eggs!" (Of course I left out lots of details, like...

https://www.silveruddsblue.org/testing-for-blue-egg-gene

Thanks! I didn't want to argue with it, just to see & understand it :)

If any of that is online, can you give a link? I cannot seem to find it with any of my searches, and I see that DarJones hasn't found it either.

Do you have a link to this article? I haven't been able to find it to read. I would question what they mean by "adjacent." The house that is adjacent to my home is not smack up against it, but there are no houses in between. So if they just mean there are no other known genes in between, we...

But when I look up "centimorgan," it is a measurement of the rate of crossover. 1 centimorgan = 1% chance of crossing over. So 4 centimorgans = 4% crossing over. And 5% crossing over would be 5 centimorgans. Are you working with a different definition of centimorgan?

You could try "Genetics of the Fowl," a book by F. B. Hutt, published in 1949. I found it for free, on Cornell University's website, but I can't figure out how to make a link that works. (I just googled for the title & author.) Chapter 14 talks about linkages between genes, and mentions "O...