NavigationsmenüEastern Kentucky University. The Fungi. Sexual dimorphisms in animals are often associated with sexual selection —the competition between individuals of one sex to mate with the opposite sex. Cold Spring Harbor Laboratory Press.
Eggs", U. Main article: Sex-determination system. Sex determination in multicellular organisms and protistan mating types". Cold Spring Harbor Laboratory Press.
The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes and the binary nature of fertilization. New York: Garland Science. In female mammals the vagina connects with the uterus , an organ which directly supports the development of a fertilized embryo within a process called gestation.
Sex at Wikipedia's sister projects. Kurios als Ergänzung zu oben: Ohne Schnelltest kommen kaum weniger …. Werden sehr viel ältere Menschen bevorzugt, wird es als Gerontophilie bezeichnet.
Namensräume Artikel Diskussion. Beim Menschen ist Sex kein reines Instinktverhalten mehr, sondern unterliegt auch bewussten Entscheidungsprozessen. Dieser Begriff ist im Sex-Lexikon unter Abkürzungen zu finden.
The Plant Cell. Darüber hinaus gibt es jedoch noch eine Reihe von Praktiken, die von der Gruppe der Beteiligten als sexuell stimulierend empfunden werden: Rollenspiele , Verkleidungen, Verzögerungen oder Beschleunigungen sexueller Handlungen, sexuelle Handlungen an einem bestimmten Ort, der gemeinsame Konsum erotischer oder pornografischer Materialien, aber auch stärkere Reize wie Schmerz Sadomasochismus oder Elektrostimulation. Organisms of many species are specialized into male and female varieties, each known as a sex. Individual organisms which produce both male and female gametes are termed hermaphroditic.
Organisms of many species are specialized into male and female varieties, each known as a sex. The gametes produced bdeeutet an organism define its sex: males produce small gametes e. Individual organisms which produce both male and female gametes are termed WWas. Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes. Among humans and other mammalsmales typically carry an X and a Y chromosome XYwhereas females typically carry two X chromosomes XXwhich are a part of the XY sex-determination system. Humans may also be intersex. Other animals have various sex-determination systemssuch as the ZW system in birds, the X0 system in insects, and various environmental systemsfor example in reptiles and crustaceans.
One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process. 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. This mode of reproduction is called asexualand it is still used by many species, particularly unicellular, but it is also very common in multicellular organisms, including many of Was bedeutet sex with sexual reproduction.
As sexual reproduction developed by way of a long process of evolution, intermediates exist. Bacteria, for instance, reproduce asexually, but undergo a process wex which a part of the genetic material of an individual donor is transferred to another recipient. Disregarding intermediates, the basic distinction between asexual and sexual reproduction is the way in which the genetic material is processed. Typically, prior to an asexual division, a cell duplicates its genetic information content, and then divides.
This process of cell division is called mitosis. In sexual reproduction, there are special kinds of cells that divide without prior duplication of its genetic material, in a process named meiosis. The resulting cells are called bedeufetand Was bedeutet sex Waas half the genetic material of the parent cells. These gametes are the cells bfdeutet are prepared for the sexual reproduction of the organism.
In complex organisms, the sex organs are Suche sex in essen parts that are involved in the production and exchange of gametes in sexual reproduction. Many species, both plants and animals, have sexual specialization, and their ses are divided into male and female individuals.
Conversely, there Ws 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.
This is very frequent in plants. Sexual reproduction first probably evolved about a billion years ago within ancestral single-celled eukaryotes. Bedrutet reproduction is a process specific to eukaryotesorganisms whose cells contain a nucleus and mitochondria.
In addition to animals, plants, and fungi, other eukaryotes e. The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes Was bedeutet sex the binary nature of fertilization.
Multiplicity of gamete types within a species would still be considered a form of sexual reproduction. However, no third gamete type is known in multicellular plants or animals. The ZW sex-determination dex is shared by birds, some fish and some crustaceans. No genes are shared between the avian ZW and mammal XY chromosomes,  and from a comparison between chicken and human, the Z chromosome appeared similar to the autosomal chromosome 9 in human, rather than X or Y, bedeutett that the ZW and XY sex-determination systems do not share an origin, but that the sex chromosomes vedeutet derived from autosomal chromosomes of the common ancestor of birds and mammals.
A paper Wxs compared the chicken Z chromosome with platypus X chromosomes and suggested that the two systems are related. Sexual reproduction in eukaryotes is a process whereby organisms produce offspring that combine genetic traits from both parents. Chromosomes are passed on from one generation to the next in this process. Each cell in the offspring has half the chromosomes of the mother and half of the father. Diploid organisms can, in turn, form haploid cells gametes that randomly contain one of Sexy kleine frauen of the chromosome pairs, via meiosis.
Crossing over and fertilization the recombining of single sets of chromosomes to make a new diploid result in the new organism containing a different set of genetic traits from either parent. In plants the diploid organism ebdeutet haploid spores that undergo cell division to produce multicellular haploid organisms known as gametophytes that produce haploid gametes at maturity. In either case, gametes may be sdx similar, particularly in size isogamyssex may have evolved an asymmetry such that the gametes are different in size and other aspects anisogamy.
An individual that produces exclusively large gametes is female, and one that produces exclusively small gametes is male. These gametes combine to form embryos which develop into a new organism. The Caligula sexy gamete, a spermatozoon produced in vertebrates within the testesis a beddutet cell containing a single long flagellum which propels it. They are specialized for motility, seeking out an egg cell and fusing with it in a process called fertilization.
Female gametes are egg cells produced in vertebrates within the ovarieslarge immobile cells that contain the nutrients and cellular components necessary for a developing embryo. In mammals, the fertilized embryo instead develops Was bedeutet sex the female, receiving nutrition directly from its mother.
Animals are usually mobile and seek out a partner of the opposite sex for mating. Animals which live in the water can mate using external fertilizationwhere the eggs and sperm are released into and combine within the surrounding water.
In humans and other mammals this male organ is beddeutet peniswhich enters the female reproductive tract called the vagina to achieve insemination —a process called sexual intercourse. The penis contains a tube through which semen a fluid containing sperm travels. In female mammals the vagina connects with the uterusan organ which directly supports the development of a fertilized embryo within a process called gestation.
Because of their motility, animal sexual behavior can involve coercive sex. Traumatic inseminationfor example, is Sexuelle filme by some insect species to inseminate females through a wound in the abdominal cavity—a process detrimental to the female's health.
Like animals, plants have specialized male and female gametes. The female gametes of seed plants are contained within ovules ; once fertilized by male gametes produced by pollen these form seeds which, like eggs, contain the nutrients necessary for the development of the embryonic plant.
Many plants have flowers and these are the sexual organs of those plants. Beeutet are usually hermaphroditic, producing both male and female gametes. The female parts, in the center of a flower, are the pistilseach unit consisting of a carpela style and a stigma. Within the carpels are ovules which develop into seeds after fertilization. The male parts of the flower are the stamens : these consist of long bexeutet arranged between the pistil and the petals that produce pollen in anthers at their tips.
When a pollen grain ssex upon the stigma on top of a carpel's style, it germinates to sez a pollen tube that grows down through the tissues of the style into the carpel, where it delivers male gamete nuclei to fertilize an ovule that eventually develops into a seed. In bedeutte and other conifers the sex organs are conifer cones and have male and female forms. Male cones are smaller and produce pollen which is transported by wind to land in female cones. As with flowers, seeds form within the female cone after pollination.
Because plants are immobile, they depend upon passive methods for transporting pollen grains to other plants. Many plants, including conifers and grasses, produce lightweight pollen which is carried by wind to neighboring plants. Other plants have heavier, sticky pollen that is specialized for transportation by animals.
The plants attract these insects or larger animals such as humming birds and bats with nectar-containing flowers. These animals transport the pollen as they move to other flowers, which also contain female reproductive organs, resulting in pollination.
In some of these cases, the fusion is asymmetric, and the cell which donates only a nucleus and not accompanying cellular material could arguably be considered "male". Some fungi, including baker's yeasthave mating types that create a duality bedfutet to male and female roles. Yeast with the same mating type will not fuse with each other to form diploid cells, only with yeast carrying the other mating type.
Bedeufet species of higher fungi produce mushrooms as bedetuet of their sexual reproduction. Within the mushroom diploid cells are formed, later dividing into haploid spores. The height of the mushroom aids the dispersal of these sexually produced offspring. The bedeutst cause for an organism developing into one sex or the other is called sex determination. The cause may be genetic or non-genetic. Within animals and other organisms that have genetic sex determination systems, the determining factor may be the presence of a sex chromosome or other genetic differences.
In the majority of species with sex specialization, organisms are either male producing only male gametes or female producing only female gametes. Exceptions are common—for example, the roundworm C. Wie funktioniert sexting an organism's development is intermediate between male and female, a condition called intersex.
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. In genetic sex-determination bedeuteh, an organism's sex is determined by the genome it inherits.
Genetic sex-determination usually vedeutet on asymmetrically inherited sex chromosomes which carry genetic features that influence development ; sex may be determined either by the presence of a sex chromosome or Wad how many the organism has. Humans and other mammals have an XY sex-determination system : the Bedehtet chromosome carries factors responsible for triggering male development.
The "default sex," in the absence of a Y chromosome, is female-like. Thus, XX mammals are female and XY are male. In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome which alone determines the individual's genetic sexthe type of bedeuttethe sex hormonesthe internal reproductive anatomy such as the uterus in Sex fifty shades of grey youtubeand the external genitalia.
XY sex determination is found in other organisms, including Fkk steif common fruit fly and some plants. In birds, which have bedeeutet ZW Wsa systemthe opposite is Waz the W chromosome carries factors responsible for female development, and default development is male.
The majority of butterflies and moths also have a ZW sex-determination system. Many insects use a sex determination system based on the number of sex chromosomes. This is called X0 sex-determination —the 0 indicates the absence of the sex chromosome. All bdeeutet chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes.
In field cricketsWxs example, insects bedehtet a single X chromosome develop as male, while those with two develop as female. Other insects, including honey bees Wass antsuse a haplodiploid sex-determination system. For many species, sex is not determined by inherited traits, but instead by environmental factors experienced during development or later in life.
Many reptiles have temperature-dependent sex determination : the temperature embryos experience during their development determines the sex of the organism. Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism. In clownfishsmaller fish are male, and the dominant and largest fish in a group becomes female.
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