Sex

biological sexsexesanatomical sexgendersexual reproductionphysical sexsex assigned at birthsexualsexual activitysexual acts
Organisms of many species are specialized into male and female varieties, each known as a sex.wikipedia
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Female

femalesfeminine
Organisms of many species are specialized into male and female varieties, each known as a sex.
Female (symbol: ♀) is the sex of an organism, or a part of an organism, that produces non-mobile ova (egg cells).

Male

malesmasculine
Organisms of many species are specialized into male and female varieties, each known as a sex.
A male organism is the physiological sex that produces sperm.

Sexual dimorphism

sexually dimorphicdimorphicdimorphism
Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
Sexual dimorphism is the condition where the two sexes of the same species exhibit different characteristics beyond the differences in their sexual organs.

Sexual selection

sexually selectedmale-male competitionintrasexual selection
For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.
Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).

Intersex

ambiguous genitaliaintersexualityintersex condition
Humans may also be intersex.
Intersex people are individuals born with any of several variations in sex characteristics including chromosomes, gonads, sex hormones, or genitals that, according to the UN Office of the High Commissioner for Human Rights, "do not fit the typical definitions for male or female bodies".

Y chromosome

Y-chromosomeY-DNAY
Among humans and other mammals, males typically carry an X and a Y chromosome (XY), whereas females typically carry two X chromosomes (XX), which are a part of the XY sex-determination system.
Y is normally the sex-determining chromosome in many species, since it is the presence or absence of Y that typically determines the male or female sex of offspring produced in sexual reproduction.

XY sex-determination system

XYXXMaternal influence on sex determination
Among humans and other mammals, males typically carry an X and a Y chromosome (XY), whereas females typically carry two X chromosomes (XX), which are a part of the XY sex-determination system.
In this system, the sex of an individual is determined by a pair of sex chromosomes.

Hermaphrodite

hermaphroditichermaphroditismhermaphrodites
Individual organisms which produce both male and female gametes are termed hermaphroditic.
In biology, a hermaphrodite is an organism that has complete or partial reproductive organs and produces gametes normally associated with both male and female sexes.

Sexual reproduction

sexuallysexualreproduce sexually
Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.
After the pollen tube grows through the carpel's style, the sex cell nuclei from the pollen grain migrate into the ovule to fertilize the egg cell and endosperm nuclei within the female gametophyte in a process termed double fertilization.

Mating

matematescopulation
Animals are usually mobile and seek out a partner of the opposite sex for mating.
In biology, mating is the pairing of either opposite-sex or hermaphroditic organisms, usually for the purposes of sexual reproduction.

Spermatozoon

spermatozoaspermsperm cells
The gametes of animals have male and female forms—spermatozoa and egg cells.
In mammals, the sex of the offspring is determined by the sperm cell: a spermatozoon bearing a X chromosome will lead to a female (XX) offspring, while one bearing a Y chromosome will lead to a male (XY) offspring.

Gamete

gametesgameticreproductive cells
Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.
Humans and most mammals use the XY sex-determination system in which a normal ovum can carry only an X chromosome (of the X and Y chromosomes), whereas a sperm may carry either an X or a Y (a non-normal ovum can end up carrying two or no X chromosomes, as a result of an irregularity at either of the two stages of meiosis, while a non-normal sperm cell can end up carrying either no sex-defining chromosomes, an XY pair, or XX pair as a result of the forementioned reason); ergo the male sperm determines the sex of any resulting zygote, if the zygote has two X chromosomes it will develop into a female, if it has an X and a Y chromosome, it will develop into a male.

Evolution

evolvedtheory of evolutionevolutionary
In either case, gametes may be externally similar, particularly in size (isogamy), or may have evolved an asymmetry such that the gametes are different in size and other aspects (anisogamy).
In contrast, the offspring of sexual organisms contain random mixtures of their parents' chromosomes that are produced through independent assortment.

Isogamy

conjugationisogamousSexual conjugation
In either case, gametes may be externally similar, particularly in size (isogamy), or may have evolved an asymmetry such that the gametes are different in size and other aspects (anisogamy). Gametes can be identical in form and function (known as isogamy), but, in many cases, an asymmetry has evolved such that two different types of gametes (heterogametes) exist (known as anisogamy).

Protist

ProtistaprotistsProtoctista
In addition to animals, plants, and fungi, other eukaryotes (e.g. the malaria parasite) also engage in sexual reproduction.
Although sexual reproduction is widespread among extant eukaryotes, it seemed unlikely until recently, that sex could be a primordial and fundamental characteristic of eukaryotes.

Anisogamy

anisogamous
In either case, gametes may be externally similar, particularly in size (isogamy), or may have evolved an asymmetry such that the gametes are different in size and other aspects (anisogamy). Gametes can be identical in form and function (known as isogamy), but, in many cases, an asymmetry has evolved such that two different types of gametes (heterogametes) exist (known as anisogamy).

Sex organ

genitaliagenitalsgenital
In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametes in sexual reproduction.
In typical prenatal development, sex organs originate from a common primordium during early gestation and differentiate into male or female sexes.

Sex differences in humans

gender differencessex differencesbiology of gender
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.
In humans, biological sex consists of five factors present at birth: the presence or absence of the SRY gene (an intronless sex-determining gene on the Y chromosome), the type of gonads, the sex hormones, the internal reproductive anatomy (such as the uterus), and the external genitalia.

Sex and gender distinction

sex or gendersex and genderdistinct
The distinction between sex and gender differentiates a person's biological sex (the anatomy of an individual's reproductive system, and secondary sex characteristics) from that person's gender, which can refer to either social roles based on the sex of the person (gender role) or personal identification of one's own gender based on an internal awareness (gender identity).

Sex assignment

assigned male at birthassigned female at birthassigned sex
Sex assignment (sometimes known as gender assignment) is the determination of an infant's sex at birth.

Organism

organismsflora and faunaliving organisms
Organisms of many species are specialized into male and female varieties, each known as a sex.

Genetics

geneticgeneticistgenetically
Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.

Cell (biology)

cellcellscellular
Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.

Sperm

sperm cellspermatiasperm cells
The gametes produced by an organism define its sex: males produce small gametes (e.g. spermatozoa, or sperm, in animals) while females produce large gametes (ova, or egg cells).

Egg cell

ovumovaegg
The gametes produced by an organism define its sex: males produce small gametes (e.g. spermatozoa, or sperm, in animals) while females produce large gametes (ova, or egg cells).