Originally Posted by Scatterknit
Would any of our esteemed CL genetics folks be willing to answer some general "Cream Legbar Genetics for dummies" questions? In simple language for dummies? Yes like me.
1. If you cross a CL Roo with another breed when would you expect to see (or chances of seeing) white spots on cockerel chicks or chipmunk stripes?
2. Same question but for a CL Hen with another breed? Is it different? Why?
A CL hybrid may be sex-linked but isn't likely to be auto-sexing through the generations, right? Or not?
3. If you cross a CL with a brown egg layer, you'll probably get some shade of green egg? How does that work? Do the egg laying colors combine?
4. If you cross a CL with another blue egg layer like a pure Ameraucana, or an EE hen that lays blue eggs, would you likely see blue eggs?
5. If you cross a CL with a white egg layer, would you expect to see blue eggs? White eggs? Very light blue eggs?
6. What cross would you think would give the deepest blue eggs?
7. Can you recommend a good source for reading about genetics, for non-science majors? In other words, for dummies? :)
1. if cross to ER(Birchen allele) or Extended Black(all black birds, most of them are based on the E/E allele) will produce(both genders as CL roo would be passing his sex linked barring gene to both genders)Black chicks(yellow underbelly) with a headspot, so no sex links here, IF cross to a none barred breed that has these e alleles: wheaten(eWh), eb(brown but also called partridge) or another e+ most of the chicks will show an intermediate(some more than others) chipmunk stripes but no sign of headspot on the males or females you can stil create gold/silver sex links if you cross the CL roo over a Silver based hen(with eb,eWh or e+ allele)
2. any Black or Birchen(gold based or silver based) rooster crossed to a CL hen will produce black Sexlinks, males will show the headspot on head but females wont(both chick down are black with crea underbelly) any other e allele(like ewh,eb, e+) the male chicks will not display the headspot, these mixes can only achieve autosexing trait yet again IF you cross the F1 together and select the double barred males(the only ones capable of showing a headspot)
3. the combine but at a different layers, Blue egg shell gene is Partially dominant(it has a compound effect Homozygotes O/O show a richer color) and the Brown egg shell its not a single gene its a Polygenic trait(some sexlinked). while the blue egg shell affects the entire egg shell, the brown eggshell only affects the outer shell, its like a paint(if you sand down any green eggs, they will become bluer untill the brown paint is gone)
4. CL and Araucana/Ameraucana/EE have the same O mutation if you combine both then the results will be a homozygous blue egger(one O gene from CL and the other O gene from Araucana/Ameraucana/EE)
5. if you cross a pure CL to a White leghorn you will produce what is called a "Super blue egg layer" but its not that their eggs are super blue in color but that they lay blue eggs at a super egger rate, their egg color will be lighter in shade because they will only cary one copy of the blue egg shell gene(O/o+ as opposed to O/O homozygotes.
6. personally I think CL x Native South American blue eggers will produce the deepest blue eggs, I have a friend that she has isolated what she calls a Shiny egg gene(autosomal recessive) and a Mate egg shell gene(autosomal dominant) this shiny egg gene will allow for pullets to lay shiny blue eggs like some south american native hens (source http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=107835&page=all )