Supplementary Table S1 Click here for additional data file. Neuropsychologia 38 — Genetics: the X factor. High ratios could indicate positive selection for a functionally different gene. Sexual selection is considered the major cause of sexual dimorphism, but recent observations suggest that natural selection may play a more important role in the evolution of sex differentiation than previously recognized.
Comparisons are made to a common ancestor of both chimps and humans, the so-called out-group method. Annual Review of Genomics and Human Genetics 6 69 —
New York: Arbor House. Cerebral Cortex. Home Research highlights Ecology: The sex role reversal. In David M. However, a more powerful analysis reveals that the choice made by the enclosed females predicted which male she subsequently got to mate or dance with in the large but not in the small treatment Figure 2.
Neuroimage 31 31 — The effects of habitat, sex, and their interaction on shape PC2 as well as covariate size were all significant. Check for updates.
X-inactivation profile reveals extensive variability in X-linked gene expression in females. Sex differences in sex chromosome gene expression in mouse brain. Evidence was initially found in the Zebra finch. Genes advantaging males will increase the chances of their passing on those genes to the next generation 8.
All computations were done using R v. However, females in the river habitat display a stronger reduction in head size than do males, and this could be related to the fact that females and males have different behaviors during the reproductive period Vinyoles et al.