The blue egg and pea comb genes are so closely linked that they are generally inherited together. A bird which has a pea comb will nearly always lay a blue shelled egg if it is a hen or pass the traits to its offspring if it is a rooster. The naked neck gene and silkie genes are further down the chromosome. There are suggestions that the Turken arose out of a cross between a Brush Turkey and an Araucana but this is not possible given that they are two different species with different chromosome numbers. I have crossed the Turken with a number of bantam breeds and found the offspring are all fertile.
Turken hens are interesting in that they have virtually no wattles or comb.
I have found two types of pea combs in the Turken which can be selected for when breeding. One type has a small pea comb as seen in the red coloured hen shown in the left picture and the other has a different form of the pea comb which I call a bulbous comb as seen in the rooster on the right. Hens with the bulbous form of the pea comb have no comb at all but flat red skin where the comb should be. This is difficult to see in the picture of the hen on the top of the page. I have used the the Turken to introduce the blue egg shell gene into the Chinese Silkie breed.