The somatic chromosome number is the same as in the duck, 76 in the [male], 77 in the [female]. As in the duck, the 76 chromosomes appear to fall into 3 general groups. In the duck these consist of 6 pairs of large chromosomes, including 3 J-shaped and three rod-shaped; 9 pairs of short rod-shaped chromosomes; and 23 pairs of globe-shaped chromosomes. In the turkey the 1st group consists of 6 pairs of large chromosomes, including 4 pairs of J-shape and 2 of rod-shape. The 2nd group consists of 3 pairs of short rod-shaped chromosomes; the 3rd group consists of 29 pairs of globe-shaped chromosomes, which, as in the duck, form a closely graduated series. As in the duck there appear to be 38 bivalents in the primary spermatocytes of the [male]. These agree with the somatic cells in size gradations. Gonomeric grouping occurs in the amnion cells as it does in the duck. Filamentous linkage as in the duck occurs in certain stages of the prophase and metaphase. The sex-mechanism appears to be of the WwZ-ZZ type similar to that found in the duck and in the moth Phragmatobia.