Distribution of genes with high ovary-, testis-, and soma-biased expression in the genome. Gene positions are shown on the chromosome arms to scale with the positions of all genes on the five major chromosome arms (fourth and Y chromosomes not shown) presented as single tick marks for each in the upper column (All). The positions of genes represented by element species highly expressed in gonads and somatic tissues are presented in adjacent rows. The element species defined as highly expressed in the three tissue categories were up in multiple pairwise comparisons; ovary-biased (from microarrays versus both testis and female carcass), testis-biased (versus both ovary and male carcass) and somatic-biased (common among male carcass versus testis, and female carcass versus ovary). Asterisks indicate gene neighborhoods identified by Monte Carlo simulations with highly significant P values (*P < 10-3, **P < 10-4, ***P < 10-5).