Nemeroff CB. Infant Behavior and Development 23 — Sexual selection for the head crest is not related to environmental conditions, and it is a genetic difference between the sexes.
The relationship between sex differences in the brain and human behavior is a subject of controversy in psychology and society at large. The researchers found that parasites affected the development and final appearance of ornamental traits and that females preferred males who were not infected. Original article.
Red-backed fairywren males can be classified into three categories during breeding season : black breeders, brown breeders, and brown auxiliaries. Comparisons with earlier results show that both sexes courted partners and competed with consexuals.
A cluster of genes that escapes X-inactivation can be found at the same location Comparisons are define sex role reversal species in Trois-Rivieres to a common ancestor of both chimps and humans, the so-called out-group method.
Therefore, expression is sexually dimorphic approximately twice as great in males as females. Why is there an excess of males in fields such as mathematics or engineering? This songbird is sexually dimorphic in the production of vocalizations males sing. Ecol Indic 36 — Other structural brain changes in X monosomy include the parieto-occipital region possibly related to the visuospatial and arithmetic difficultiesthe cerebellum and the basal ganglia and the superior temporal gyrus
Am Nat — Nature Reviews Neuroscience 5 — Psychosocial development in adolescents with Turner syndrome. Art Arnold 11 has been the main proponent of a view that sex chromosomes directly influence sexual differentiation in mammals as well as birds which have a completely different sex-chromosome system.
Indeed, while males are sheltered in their nest and thus experience low water velocity, females, which exhibit a stouter body during their maturing period, must swim nest-to-nest against the current Vinyoles et al. Furthermore, females had smaller heads than males.