The existence of separate sexes has evolved independently at different times and in different lineages, an … See more

The evolution of anisogamy led to the evolution of male and female function. Before the evolution of anisogamy, mating types in a species were isogamous: the same size and both could move, catalogued … See more

A common symbol used to represent the male sex is the Mars symbol ♂, a circle with an arrow pointing northeast. The Unicode code-point is:
U+2642 ♂ MALE SIGN (♂)
The symbo… See more

Species that are divided into females and males are classified as gonochoric in animals, as dioecious in seed plants and as dioicous in cryptogams.
Males can coexist with hermaphrodites, a sexual syst… See more

The sex of a particular organism may be determined by a number of factors. These may be genetic or environmental, or may naturally change during the course of an organism's life. Although most species have only two se… See more

Male animals have evolved to use secondary sex characteristics as a way of displaying traits that signify their fitness. Sexual selection is believed to be the driving force behind the development of these characterist… See more

• Male pregnancy
• Masculinity
• Gentleman See more