Dimorphism

January American Naturalist highlights

... and the evolution of display trait sexual dimorphism by natural and sexual selection" Stephen F. ... selection on such traits. The evolution of sexual dimorphism is hampered, however, because the sexes share the ... the authors show that the amount of sexual dimorphism varies and that these differences among ...

Male or female? Coloring provides gender cues

... and his Universit de Montral team found the luminescence of the eyebrow and mouth region is vital in rapid gender discrimination. "As teenagers, dimorphism (systematic difference between sexes) increases in the nose, chin, mouth, jaw, eyes and general shape of faces," says Nicolas Dupuis-Roy, lead author ...

Dimorphism in Biological News

Adiponectin is a metabolic link between obesity and bone mineral density

... can modulate bone metabolism". Moreover, Dr. Archer said, "female mice exhibited a stronger response than males, and this is likely due to the sexual dimorphism in these mice whereby females have significantly higher circulating levels than males". Dr. Steven R. Goodman, Editor-in-Chief of Experimental ...

Why do males and females frequently differ in body size and structure?

... ways of doing this vary enormously among species, said Fairbairn , a professor of biology. We see this reflected in fantastic patterns of sexual dimorphism that we have only begun to appreciate. The book includes numerous examples of gender differences seen in nature. For example, why female spiders ...

News tips from the Journal of Neuroscience

... F. Rissman Long before their role during puberty and adulthood becomes manifest, gonadal hormones exert influence on the development of sexual dimorphism in the brain. This week, Kauffman et al. examined the role of GPR54, a G-protein-coupled membrane receptor for kisspeptin, in the development of ...

Vanishing beetle horns have surprise function

... Most scientists have assumed the sexual dimorphism of some Onthophagus beetles was borne of ... nigriventris and binodis exhibit typical sexual dimorphism -- adult males have horns, females are hornless. In sagittarius, the sexual dimorphism is reversed. Adult females and males of the ...

Zebra finch males prefer females with exaggerated maternal traits

... been demonstrated previously. The outcome of the study shows that the skewed mating preferences that are crucial for driving the evolution of sexual dimorphism and exaggerated traits in birds may result directly from sexual imprinting. ...

Wisconsin scientists discover a master key to microbes' pathogenic lifestyles

... remain dormant until immune defenses are lowered. It's a significant medical problem in endemic regions." The discovery of the switch that governs dimorphism and virulence in this prevalent class of fungi provides a target for new therapeutic agents and might even help underpin a vaccine able to thwart ...

Dog genome sequenced

... between male and female dogs. They attribute the differences to at least two interacting loci, one of which is located on the X chromosome. "Sexual dimorphism seems to have evolved as females became smaller than males due to natural selection for optimal size," Lark explains. "This is consistent with our ...

Scientists fetch useful information from dog genome publications

... between male and female dogs. They attribute the differences to at least two interacting loci, one of which is located on the X chromosome. "Sexual dimorphism seems to have evolved as females became smaller than males due to natural selection for optimal size," Lark explains. "This is consistent with our ...

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Dimorphism in Biological Dictionary

Dimorphism

... Sexual dimorphism , differences in the body appearance of a species based on sex. Nuclear dimorphism , when a cell's nuclear apparatus is composed of two ... Definition of dimorphism from the Merriam-Webster Online Dictionary with ...