Structured Differently

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Science  02 Apr 2010:
Vol. 328, Issue 5974, pp. 19
DOI: 10.1126/science.328.5974.19-d

Selection may amplify or promote sex-specific differences within a species, and many morphological and behavioral changes have been correlated with differences between the sexes within a species. Li and Merila investigated genome-based sex bias in wild Siberian jays and identified a significant amount of genomic differentiation between males and females. They found that on average, females were more heterozygous than males; that the Z sex chromosome showed greater selection than the autosomes; and that linkage disequilbrium differed between the sexes, with males showing lower levels than females. These data suggest that females and males experience different selective forces, which may either be due to or drive life history traits, such as sex-specific dispersal.

BMC Evol. Biol. 10, 10.1186/1471-2148-10-66 (2010).

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