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In sexually reproducing species, it is applicable mostly to situations where ecological pressures prevent most competitors from reaching maturity, or where crowding or pair-bonding or an extreme suppression of sexual selection factors prevents the normal sexual competition rituals and selection from taking place, but which also prevent artificial selection from operating, e. g. arranged marriages, where parents rather than the young select the mate based on economic or even astrological factors, and where the sexual desires of the mated pair are often subordinated to these factors, are artificial unless wholly based on an ecological factor such as control of land which is held by their own force.
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sexually and reproducing
In classical genetics, in a sexually reproducing organism ( typically eukarya ) the gamete has half the number of chromosomes of the somatic cell and the genome is a full set of chromosomes in a gamete.
When people say that the genome of a sexually reproducing species has been " sequenced ", typically they are referring to a determination of the sequences of one set of autosomes and one of each type of sex chromosome, which together represent both of the possible sexes.
It has been hypothesized that this reproductive adaptation allows a single female to enter an isolated ecological niche ( such as an island ) and by parthenogenesis produce male offspring, thereby establishing a sexually reproducing population ( via reproduction with her offspring that can result in both male and female young ).
This gives rise to genetic diversity in sexually reproducing populations.
Meiosis is a key feature for all sexually reproducing eukaryotes in which homologous chromosome pairing, synapse and recombination occur.
The life cycle of a sexually reproducing organism.
Cell division also enables sexually reproducing organisms to develop from the one-celled zygote, which itself was produced by cell division from gametes.
In sexually reproducing species, individuals produce special kinds of cells ( called gametes ) whose function is specifically to fuse with one unlike gamete and thereby to form a new individual.
Basically, Basidiomycota are filamentous fungi composed of hyphae ( except for yeasts ), and reproducing sexually via the formation of specialized club-shaped end cells called basidia that normally bear external meiospores ( usually four ).
A species may become functionally extinct when only a handful of individuals survive, which cannot reproduce due to poor health, age, sparse distribution over a large range, a lack of individuals of both sexes ( in sexually reproducing species ), or other reasons.
The shuffling of genes brought about by genetic recombination is thought to have many advantages, as it is a major engine of genetic variation and also allows sexually reproducing organisms to avoid Muller's ratchet, in which the genomes of an asexual population accumulate deleterious mutations in an irreversible manner.
In sexually reproducing multicellular organisms, the nucleotide substitution must arise within one of the many sex cells that an individual carries.
The ability to sexually reproduce, in other words, is the main ontological distinction between a genuine being and faux or pretend entities that cannot share interests nor sympathize with sexually reproducing beings.
In biology, sexuality describes the reproductive mechanism as well as the basic biological drive that exists in all sexually reproducing species and can encompass sexual intercourse and sexual contact in all its forms.
* One species of jellyfish, Turritopsis nutricula, reverts to a sexually immature stage after reproducing, rather than dying as in other jellyfish.
In sexually reproducing organisms non-recombining chromosomes or chromosomal regions such as the mammalian Y chromosome ( with the exception of multi-copy sequences which do engage intrachromosomal recombination and gene conversion ), should also be subject to the effects of Muller's ratchet.
Copulation is the union of the sex organs of two sexually reproducing animals for insemination and subsequent internal fertilization.
Although most hydrozoans have a medusoid stage, this is not always free-living, and in many species, exists solely as a sexually reproducing bud on the surface of the hydroid colony.
The early ethologists assumed that communication occurred for the good of the species as a whole, but this would require a process of group selection which is believed to be mathematically impossible in the evolution of sexually reproducing animals.
Spermatozoa are the mature male gametes in many sexually reproducing organisms.
It is these new combinations of parts of chromosomes that provide the major advantage for sexually reproducing organisms by allowing for new combinations of genes and more efficient evolution.
Males will become sexually active after their first year of life and females generally take two years before they can start reproducing.
All sexually reproducing organisms derive from a common ancestor which was a single celled eukaryotic species.
sexually and species
A single sexually dimorphic species allows behavioural interpretations.
All sexually dimorphic species of over exhibit a polygynous breeding strategy.
While some genetically modified plants are developed by the introduction of a gene originating from distant, sexually incompatible species into the host genome, cisgenic plants contain genes that have been isolated either directly from the host species or from sexually compatible species.
Among the species, black-tailed prairie dogs tend to be the least sexually dimorphic, and white-tailed prairie dogs tend to be the most sexually dimorphic.
Both size classes lived along side each other, and while researchers had previously suggested that they represent different species, Christopher Bennett showed that the differences between them are consistent with the concept that they represent females and males, and that Pteranodon species were sexually dimorphic.
Most scorpions reproduce sexually, and most species have male and female individuals.
Many early accounts which apparently refer to this animal describe the males as being sexually aggressive towards human women and towards females of its own species.
Southern resident species typically show less sexual dimorphism, although there are exceptions like the Paradise Shelduck of New Zealand which is both strikingly sexually dimorphic and where the female's plumage is brighter than that of the male.
It appears that the ability to reproduce sexually has evolved independently in various species on many occasions.
The blacktip shark ( Carcharhinus limbatus ), flatworm ( Dugesia tigrina ) and some other species can reproduce either sexually or asexually depending on various conditions.
Sex can be determined by examination of anatomy in some sexually non-dimorphic species.
Echinoderms become sexually mature after approximately two to three years, depending on the species and the environmental conditions.
Almost all species of velvet worm reproduce sexually.
All species are in principle sexually distinct and bear, in many cases, a marked sexual dimorphism: the females are usually larger than the males and have, in species where the number of legs is variable, more legs.
Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously over a period of one to several nights around a full moon.
sexually and is
When a husband is sexually selfish and heedless of his wife's desires, she is cheated of the fulfillment and pleasure nature intended for her.
No one seriously contends, of course, that the domineering wife is, sexually speaking, a new character in our world.
It is not entirely understood why the ability to reproduce sexually is so common among them.
To holders of this view, one's orientation is defined by whom one is predisposed to fall in love with, whether or not one desires that person sexually.
The film was a commercial success, but was highly controversial owing to its portrayal of African American men ( played by white actors in blackface ) as unintelligent and sexually aggressive towards white women, and the portrayal of the Ku Klux Klan ( whose original founding is dramatized ) as a heroic force.
* Bisexuality, in human sexuality, describes a man or woman that is sexually or romantically attracted to persons of both sexes
It is sexually mature at four years or five years of age.
It is possible for sexually inactive persons to get infected with bacterial vaginosis.
Chlamydia infection ( from the Greek, χλαμύδα meaning " cloak ") is a common sexually transmitted infection ( STI ) in humans caused by the bacterium Chlamydia trachomatis.
Chlamydia infection is one of the most common sexually transmitted infections worldwide ; it is estimated that about 1 million individuals in the United States are infected with chlamydia.
Chlamydial infection of the neck of the womb ( cervicitis ) is a sexually transmitted infection which is asymptomatic for about 50-70 % of women infected with the disease.
For sexually active women who are not pregnant, screening is recommended in those under 25 and others at risk of infection.
However, both the small and large diprotodonts coexisted throughout the Pleistocene and the size difference is similar to other sexually dimorphic living marsupials.
Pornography's objective is the graphic depiction of sexually explicit scenes.
One of the German POWs successfully seduces the beautiful and tough Red Army Captain Alexandra Kasalniskaya ( Eva Bartok ) who prefers him to the sadistic camp commandant, which as Bartov comments also is meant to show that even in defeat, German men were more sexually virile and potent than their Russian counterparts.
Block's case has continued for five years and he has gone from being a successful businessman to being almost bankrupt and is virtually enslaved by his dependence on the lawyer and Leni, with whom he appears to be sexually involved.
This act may mean that she is sexually interested instead of just flirting.
Her sexually voracious next door neighbor Suzy ( Sandra Milo ) introduces Juliet to a world of uninhibited sensuality but Juliet is haunted by childhood memories of her Catholic guilt and a teenaged friend who committed suicide.
A gamete ( from Ancient Greek γαμέτης gametes " husband " / γαμετή gamete " wife ") is a cell that fuses with another cell during fertilization ( conception ) in organisms that reproduce sexually.
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