Sex: differenze tra le versioni

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Changed mobile to motile.
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In biology, '''sex''' refers to the categorization of organisms (or their parts) with regard to the role they play in reproduction.  When a species reproduces sexually, it usually does so by producing two types of gametes that have to come together to form a new member of the species.  One type of gamete is large and non-mobile (ova), whereas the other type is small and mobile (spermia).  When an organism or an organ produces large and non-mobile gametes, it's called '''female'''.  If it produces small and mobile gametes, it's called '''male'''.
In biology, '''sex''' refers to the categorization of organisms (or their parts) with regard to the role they play in reproduction.  When a species reproduces sexually, it usually does so by producing two types of gametes that have to come together to form a new member of the species.  One type of gamete is large and non-mobile (ova), whereas the other type is small and motile (spermia).  When an organism or an organ produces large and non-mobile gametes, it's called '''female'''.  If it produces small and motile gametes, it's called '''male'''.


In most mammals, in particular humans, female members of the species can be identified by having two X chromosomes, ovaries, a uterus and a vagina.  The ovaries produce ova (also called egg cells), which may be fertilized into a zygote, which travels to the uterus to develop into an embryo, a fetus, and ultimately a baby which is brought to the world through the vaginal canal.  Males can be identified by having an X and a Y chromosome, testes (testicles) and a penis.  The testes produce sperm, which are ejaculated into the vagina during sexual intercourse, from where they might travel towards the ova to fertilize them.
In most mammals, in particular humans, female members of the species can be identified by having two X chromosomes, ovaries, a uterus and a vagina.  The ovaries produce ova (also called egg cells), which may be fertilized into a zygote, which travels to the uterus to develop into an embryo, a fetus, and ultimately a baby which is brought to the world through the vaginal canal.  Males can be identified by having an X and a Y chromosome, testes (testicles) and a penis.  The testes produce sperm, which are ejaculated into the vagina during sexual intercourse, from where they might travel towards the ova to fertilize them.
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