Posting this as Educational Post, source>
https://www.backyardchickens.com/t/301500/naked-neck-turken-thread/10290#post_13251581
Quote:
Ok I will try to explain this..
Most Easter Eggers have only one Copy of the blue egg shell gene(Unless is a pure Ameraucana, which EEs are not) that single Copy of the blue egg shell gene is Linked the Pea Comb by 4 centimorgan, so its very very close, so what does this link thing means? it means that whererver the Pea comb genes goes, the blue egg shell gene will follow, and the single comb gene that is also pressent on the EE hen does not have a blue egg shell gene linked to it, so it means that wherever the single gene comb goes, it will go alone and will not have a blue egg shell gene.. so the Mother Had only one copy of the Pea comb gene and looks like she inherit her Offspring(your pink egg laying pullet) that lonly single comb gene.. so from Dame side she is NOT getting the blue egg shell gene
Now to the Sire side The Sire inherited Only 1 Copy of the blue egg shell gene from the Cream legbar(therfore his sisters layd blue colored eggs) But guess What? Remember how the blue egg shell gene is linked to the pea comb? well sometimes(about 3% chance) the blue egg shell will migrate to the single comb gene, Dr. Punnett got Chilean hens that had single comb and that also laid blue eggs, these hens were the foundation stock for the cream legbar, these hens were what is know in genetic terms, Recombinants, Their Blue egg shell gene is now Linked to that specific single comb, not any single comb just that one, so what this means is that while sire is single combed(p+/p+) one of those single comb gene has a blue egg shell gene attached to it and it wont go anywere else alone(wont segregate independently)
so this is what happened..
Dame Genetic Make up p+(o+)/P(O) where p+ is single comb and o+ is white egg shell..
Sire Genetic Make up p+(O)/p+(o+) sow what is the change of your Pullets inheriting both p+(o+)/p+(o+)
So What were the Chances of this happening to you?(chances of you not getting blue eggers even heterozygous ones) Only 25%, which is low but not improbable, if I were you I would do the same cross again, you would have 75% chance of getting blue eggers..
now to the Actuall Cross percentages
doing this cross will give you
25% chance of getting P(O)/p+(O) homozygous blue eggers (deep blue eggs)
25% chance of getting P(O)/p+(o+) heterozygous blue egger (light blue eggs)
25% chance of getting p+/(O)/p+(o+) heterozygous blue egger (light blue eggs)
25% chance of getting p+(o+)/p+(o+) white/pink colored eggs
Hope this helps
