Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism. Overview The male gamete sperm fertilizing the female gamete ovum One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process. The ZW sex-determination system is shared by birds, some fish and some crustaceans. In the majority of species with sex specialization, organisms are either male producing only male gametes or female producing only female gametes. This double-chromosome stage is called " diploid ", while the single-chromosome stage is " haploid ". The more familiar female cones are typically more durable, containing ovules within them. Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent individual.
Some plant species also exhibit dimorphism in which the females are significantly larger than the males, such as in the moss Dicranum  and the liverwort Sphaerocarpos. In many cases the male of a species is larger than the female. The resulting cells are called gametes , and contain only half the genetic material of the parent cells. Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms. Because plants are immobile, they depend upon passive methods for transporting pollen grains to other plants. Sex differences in humans include, generally, a larger size and more body hair in men; women have breasts, wider hips, and a higher body fat percentage. Sex-determination system Sex helps the spread of advantageous traits through recombination. In clownfish , smaller fish are male, and the dominant and largest fish in a group becomes female. Multiplicity of gamete types within a species would still be considered a form of sexual reproduction. Many reptiles have temperature-dependent sex determination: This process of cell division is called mitosis. Sometimes intersex individuals are called "hermaphrodite"; but, unlike biological hermaphrodites, intersex individuals are unusual cases and are not typically fertile in both male and female aspects. These gametes are the cells that are prepared for the sexual reproduction of the organism. In many organisms, the haploid stage has been reduced to just gametes specialized to recombine and form a new diploid organism; in others, such as cryptogamic plants the gametes are capable of undergoing cell division to produce multicellular haploid organisms. However, no third gamete type is known in multicellular plants or animals. They are specialized for motility, seeking out an egg cell and fusing with it in a process called fertilization. Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male. Because of their motility, animal sexual behavior can involve coercive sex. Each cell in the offspring has half the chromosomes of the mother and half of the father. These animals transport the pollen as they move to other flowers, which also contain female reproductive organs, resulting in pollination. Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent individual. Many species, both plants and animals, have sexual specialization, and their populations are divided into male and female individuals. This double-chromosome stage is called " diploid ", while the single-chromosome stage is " haploid ". Evolution of sexual reproduction Different forms of anisogamy:
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