sexual dimorphism


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Related to sexual dimorphism: sexual selection, Stabilizing selection

sexual dimorphism

n
(Biology) biology differences in appearance between the males and females of a species
References in periodicals archive ?
Sperm competition and sperm storage as determinants of sexual dimorphism in the dwarf surfperch, Micrometrus minimus.
Studies on the detailed structure of fish scale are very important in the nomenclature, classification and identification of fish to major groups [30,45,35] and species levels [3,6,31], phylogeny [27,28], sexual dimorphism [22], age determination [10,44,19,21], past environment experienced by fish scale due to water pollution of the water body [12,13,16], and for growth studies [5,43,21,16,4,37,38,32,14].
Most of the fishes exhibit sexual dimorphism or secondary sexual characters by which sexes can be differentiated from each other.
Sexual dimorphism in digit length ratios of the second and fourth digit (2D:4D) has been described in humans and other species of the mammalian, reptilian, and avian genera.
Human cranial capacity ranges from 1200 to 1850 cc's and there is sexual dimorphism, which means that men and women have different skull ridges, lines, palates, orbits and sinuses.
Even though evolutionary biologists long have recognized this discrepancy, called sexual dimorphism, they have struggled for decades to solve a major paradox: How can males and females of one species be of different sizes, given that they share the same genetic blueprints dictating their development and growth?
Pheasants are characterized by strong sexual dimorphism, males being highly ornate with bright colors and adornments such as wattles and long tails.
Sexual dimorphism in canine size was analyzed from a sample of the Baldwin County, Georgia population of Didelphis virginiana (Virginia opossum).
The lion's mane is an example of sexual dimorphism (difference in form between individuals of different gender in the same species).
That trait is common for males in species that display sexual dimorphism, in which the sexes differ substantially in size or appearance.
These amygdala connectivity changes and differences in hemispheric size were found to be statistically significant, confirming the sexual dimorphism in heterosexual and homosexual subjects.
This is called reverse size sexual dimorphism (RSSD).