dimorphism
two forms or types belonging to the same species, such as males and females of the same species, but differing from each other
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
sexual dimorphism
(dy-mor-fiz-um)
A special case of polymorphism based on the distinction between the secondary sex characteristics of males and females.
sexual reproduction ...
dimorphism Existence within a species of two distinct forms according to color, sex, size, organ structure, and so on. Occurrence of two kinds of zooids in a colonial organism.
Male/Female dimorphism between organisms or reproductive organs of different sexes is not limited to animals; male gametes are produced by chytrids, diatoms and land plants, among others.
We look at brain sexual dimorphisms, which means the difference between male and female brains in terms of their structure, in terms of number of neurons in specific structures, density of neurons, ...
In many species, especially polygynous species where only a few males monopolize all the females, sexual selection has caused pronounced sexual dimorphism. In these species males compete against other males for mates.
 See also: Sexual, Animal, Species, Sexual dimorphism, Organ
  
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