In placental mammals, offspring are born as juveniles: complete animals with the sex organs present although non-functional. After several months or years, the sex organs develop further to maturity and the animal becomes sexually mature. Most female mammals are only fertile during certain periods and during those times, they are said to be "in heat". At this point, the animal is ready to mate. Individual male and female mammals meet and carry out copulation. For most mammals, males and ...

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Sexual reproduction, Sexual reproduction - Sexual reproduction of protists and fungi, Sexual reproduction - Reproduction in flowering plants, Sexual reproduction - Reproduction in reptiles, Sexual reproduction - Reproduction in birds, Sexual reproduction - Reproduction in mammals, Sexual reproduction - The mammalian male, Sexual reproduction - The mammalian female, Sexual reproduction - Gestation, Sexual reproduction - Birth, Sexual reproduction - Monotremes, Sexual reproduction - Marsupials, Sexual reproduction - Origin of Sexual Reproduction

Read more here: » Sexual reproduction: Encyclopedia II - Sexual reproduction - Reproduction in mammals

See also:

Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction, Biological reproduction - Mechanical reproduction

Read more here: » Biological reproduction: Encyclopedia II - Biological reproduction - Sexual reproduction

Sexual reproduction is a biological process by which organisms create descendants that have a combination of genetic material contributed from two (usually) different members of the species. Each of two parent organisms contributes half of the offspring's genetic makeup by creating haploid gametes. Most organisms form two different types of gametes. In these anisogamous species, the two sexes are referred to as male (producing sperm or microspores) and female (producing ova or megaspores). In isogamous species the ...

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Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction

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Coitus is the basic reproductive method of humans. During ejaculation, which normally accompanies male orgasm, a series of muscular contractions delivers semen containing male gametes known as sperm cells or spermatozoa into the vault of the vagina. The subsequent route of the sperm from the vault of the vagina, is through the cervix and into the uterus, and thence into the fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum. Sperm cells can survive up to nine days in ...

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Sexual intercourse, Sexual intercourse - Sexual reproduction, Sexual intercourse - Sex evolving beyond reproduction, Sexual intercourse - Sexual drive, Sexual intercourse - Downside of sexual intercourse, Sexual intercourse - Sexual problems, Sexual intercourse - Sexual morality and legality

Read more here: » Sexual intercourse: Encyclopedia II - Sexual intercourse - Sexual reproduction

Organisms that reproduce through asexual reproduction tend to grow in number exponentially. However, because they rely on mutation for variations in their DNA, all members of the species have similar vulnerabilities. Organisms that reproduce sexually yield a smaller amount of offspring, but the large amount of variation in their genes makes them less susceptible to disease. Many organisms can reproduce sexually as well as asexually. Aphids, slime molds, sea anemones and many plants are examples. When environmental factors are favorabl ...

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Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction, Biological reproduction - Mechanical reproduction

Read more here: » Biological reproduction: Encyclopedia II - Biological reproduction - Asexual vs. sexual reproduction

Organisms that reproduce through asexual reproduction tend to grow in number exponentially. However, because they rely on mutation for variations in their DNA, all members of the species have similar vulnerabilities. Organisms that reproduce sexually yield a smaller amount of offspring, but the large amount of variation in their genes makes them less susceptible to disease. Many organisms can reproduce sexually as well as asexually. Aphids, slime molds, sea anemones and many plants are examples. When environmental factors are favorabl ...

See also:

Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction

Read more here: » Biological reproduction: Encyclopedia II - Biological reproduction - Asexual vs. sexual reproduction

See also: Human sexuality Biological reproduction Gender Sex Other related archivesBiological reproduction, Gender, Human sexuality, Sex

Read more here: » Sexuality: Encyclopedia - Sexuality

Humans, bonobos and notably dolphins are all animals known to have non-reproductive sex, apparently for the sake of pleasure. All three animals engage in heterosexual intercourse even when the female is not in estrus, that is, at a point in her reproductive cycle suitable for successful impregnation. Likewise, all three animals engage in homosexual behaviors. That is not to say that homosexuality and non-reproductive heterosexuality are limited to these three species; rather ...

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Sexual intercourse, Sexual intercourse - Sexual reproduction, Sexual intercourse - Sex evolving beyond reproduction, Sexual intercourse - Sexual drive, Sexual intercourse - Downside of sexual intercourse, Sexual intercourse - Sexual problems, Sexual intercourse - Sexual morality and legality

Read more here: » Sexual intercourse: Encyclopedia II - Sexual intercourse - Sex evolving beyond reproduction

Biological reproduction is the biological process by which new individual organisms are produced. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction by an antecedent. The known methods of reproduction are broadly grouped into two main types: sexual and asexual reproduction. In asexual reproduction, an individual can reproduce without involvement with another individual of that species. The division of a bacterial cell into two daughter cells is an example of as ...

Including:

Biological reproduction - Asexual reproduction Biological reproduction - Sexual reproduction
Biological reproduction - Mitosis and Meiosis
Biological reproduction - Reproductive strategies Biological reproduction - Asexual vs. sexual reproduction
Biological reproduction - The Red Queen hypothesis
Biological reproduction - Life without reproduction Biological reproduction - Mechanical reproduction

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Sexual intercourse or coitus is the human form of copulation. The term sexual intercourse refers to a wider range of sexual activities than the term coitus, which only refers to male-female genital sex. See Human sexual behavior for a discussion of the broader sense of sexual intercourse and List of sexual positions for the wide variety of sexual activities that exist. See the terms frot for male-male genital sex and tribadism for female-female genital sex. "Genital sex" as used here re ...

Including:

Sexual intercourse - Sexual reproduction Sexual intercourse - Sex evolving beyond reproduction Sexual intercourse - Sexual drive Sexual intercourse - Downside of sexual intercourse Sexual intercourse - Sexual problems Sexual intercourse - Sexual morality and legality

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Asexual reproduction (also known as agamogenesis) is the simplest form of reproduction and does not involve meiosis, gamete formation, or fertilization. In laymen's terms, there is only one "parent" involved. This form of reproduction is common among simple organisms such as amoeba and other single-celled organisms, although most plants produce asexually as well (see vegetative reproduction). Because it does not require male and female participation, asexual reproduction occurs faster than sexual reproduction and ...

Including:

Asexual reproduction - Advantages and disadvantages

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Vegetative reproduction is asexual reproduction, but other terms that apply are vegetative propagation and vegetative multiplication. In essence it is any process by which new plant "individuals" arise or are obtained without production of seeds or spores. It is both a natural process in many plant species (including organisms that may or may not be considered "plants", such as bacteria and fungi) and one utilized or encouraged by horticu ...

Including:

Vegetative reproduction - Natural vegetative structures Vegetative reproduction - Horticultural aspects
Vegetative reproduction - Cultivated plants propagated by vegetative methods

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The male has two slits at the bottom side of the body: one hiding the penis and further behind one for the anus. The female has one genital slit, housing the vagina and the anus. Courtship behavior of the male includes clinging along to that female, posing for the female, stroking, rubbing, nuzzling, mouthing, jaw clapping, and yelping. Coitus is preceded by lengthy foreplay; then the two animals arrange belly to belly, the penis extends out of its slit and is inserted into the vagina. The act lasts only 10-30 seconds, but i ...

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Bottlenose Dolphin, Bottlenose Dolphin - Physical description, Bottlenose Dolphin - Behavior and life, Bottlenose Dolphin - Diet, Bottlenose Dolphin - Senses and communication, Bottlenose Dolphin - Tool use and culture, Bottlenose Dolphin - Sexuality and reproduction, Bottlenose Dolphin - Natural predators, Bottlenose Dolphin - Taxonomy, Bottlenose Dolphin - Conservation, Bottlenose Dolphin - Bottlenose Dolphins and humans, Bottlenose Dolphin - Bottlenose Dolphins in fiction

Read more here: » Bottlenose Dolphin: Encyclopedia II - Bottlenose Dolphin - Sexuality and reproduction

Sexual abstinence is the practice of voluntarily refraining from some or all aspects of sexual activity. Common reasons to deliberately abstain from the physical expression of sexual desire include religious or philosophical reasons (eg chastity), material reasons (to prevent conception or STD transmission), lack of suitable partners, or to conform to legal injunctions. Sexual abstinence has been debated since antiquity, and has been discussed both within the heterosexual and the homosexual spheres. See Platonic love ...

Including:

Sexual abstinence - Premarital chastity
Sexual abstinence - Western attitudes
Sexual abstinence - Abstinence
Sexual abstinence - Abstinence as a lifestyle Sexual abstinence - Medical aspects of abstinence
Sexual abstinence - Religious views Sexual abstinence - Modern abstinence movements
Sexual abstinence - Popularity and effectiveness
Sexual abstinence - Reference

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Biological factors / Choice / Environment Demographics / History Gender role / Gender identity Human sexual behavior / Animal sexuality Critiques of sexual behavior Gay rights / Laws / Same-sex marriage Homophobia / Biphobia / Psychology Medical science / Gay community Two-Spirit / Violence against LGBT people History of the Gay Community ...

Including:

Biology and sexual orientation - Sexual orientation and evolution Biology and sexual orientation - Politics Biology and sexual orientation - Empirical studies
Biology and sexual orientation - Twin Studies Biology and sexual orientation - Studies of brain structure Biology and sexual orientation - Chromosome linkage studies Biology and sexual orientation - Correlations with matriarchal lineage birth order and female fertility Biology and sexual orientation - Testosterone correlation Biology and sexual orientation - Pheromones correlation
Biology and sexual orientation - Early fixation hypothesis
Biology and sexual orientation - Fetal development Biology and sexual orientation - Pre-natal hormones in males Biology and sexual orientation - Correlations with matriarchal lineage birth order and female fertility Biology and sexual orientation - Pathogenic theory Biology and sexual orientation - Imprinting/Critical period Biology and sexual orientation - Chance events

Read more here: » Biology and sexual orientation: Encyclopedia - Biology and sexual orientation

The male has two slits at the bottom side of the body: one hiding the penis and further behind one for the anus. The female has one genital slit, housing the vagina and the anus. Courtship behavior of the male includes clinging along to that female, posing for the female, stroking, rubbing, nuzzling, mouthing, jaw clapping, and yelping. Coitus is preceded by lengthy foreplay; then the two animals arrange belly to belly, the penis extends out of its slit and is inserted into the vagina. The act lasts only 10-30 seconds, but i ...

See also:

Bottlenose Dolphin, Bottlenose Dolphin - Physical description, Bottlenose Dolphin - Behavior and life, Bottlenose Dolphin - Diet, Bottlenose Dolphin - Senses and communication, Bottlenose Dolphin - Cognition, Bottlenose Dolphin - Tool use and culture, Bottlenose Dolphin - Sexuality and reproduction, Bottlenose Dolphin - Natural predators, Bottlenose Dolphin - Taxonomy, Bottlenose Dolphin - Conservation, Bottlenose Dolphin - Bottlenose Dolphins and humans, Bottlenose Dolphin - Bottlenose Dolphins in fiction

Read more here: » Bottlenose Dolphin: Encyclopedia II - Bottlenose Dolphin - Sexuality and reproduction

Asexuality is relatively rare among multicellular organisms, for reasons that are not completely understood. Current hypotheses suggest that, while asexual reproduction may have short term benefits when rapid population growth is important or in stable environments, over the long term sexual reproduction offers a net advantage by allowing more rapid adaptation to changing environments. Asexual lineages can increase their numbers rapidly because (since individuals are always female) everyone can produce viable eggs. In sexual populations some ...

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Parthenogenesis, Parthenogenesis - Asexual versus sexual reproduction, Parthenogenesis - Parthenogenesis, Parthenogenesis - Gynogenesis, Parthenogenesis - Hybridogenesis

Read more here: » Parthenogenesis: Encyclopedia II - Parthenogenesis - Asexual versus sexual reproduction

List of nursing diagnoses - Wellness. Readiness for enhanced sexuality patterns List of nursing diagnoses - Risk. Risk for ineffective sexuality pattern List of nursing diagnoses - Actual. Altered sexuality patterns Sexual dysfunction ...

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List of nursing diagnoses, List of nursing diagnoses - Health perception--Health management, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Nutritional--Metabolic, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Elimination, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Activity--Exercise, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Sleep-rest, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Cognitive--Perceptual, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Self-perception--Self-concept, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Role--Relationship, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Sexuality--Reproductive, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Coping--Stress tolerance, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual, List of nursing diagnoses - Value--Belief, List of nursing diagnoses - Wellness, List of nursing diagnoses - Risk, List of nursing diagnoses - Actual

Read more here: » List of nursing diagnoses: Encyclopedia II - List of nursing diagnoses - Sexuality--Reproductive

A major goal in the field of robots is self-replicating machines. Since all robots (at least in modern times) have a fair number of the same features, a self-replicating robot (or possibly a hive of robots) would need to do the following: Obtain construction materials Manufacture new parts Provide a consistent power source Program the new members To date, this has not been done. On a nanotechnical scale, nanomachines might also be designed to reproduce under their own power. This, in turn, has given rise to the "gray goo" theory of Armaggedon, as featu ...

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Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction, Biological reproduction - Mechanical reproduction

Read more here: » Biological reproduction: Encyclopedia II - Biological reproduction - Mechanical reproduction

The existence of life without reproduction is the subject of some speculation. The biological study of how the origin of life led from non-reproducing elements to reproducing organisms is called abiogenesis. Whether or not there were several independent abiogenetic events, biologists believe that the last common ancestor to all present life on earth lived about 3.5 billion years ago. Today, some scientists have speculated about the possibility of creating life non-reproductively in the laboratory. One group of scientists has succeeded ...

See also:

Biological reproduction, Biological reproduction - Asexual reproduction, Biological reproduction - Sexual reproduction, Biological reproduction - Mitosis and Meiosis, Biological reproduction - Reproductive strategies, Biological reproduction - Asexual vs. sexual reproduction, Biological reproduction - The Red Queen hypothesis, Biological reproduction - Life without reproduction

Read more here: » Biological reproduction: Encyclopedia II - Biological reproduction - Life without reproduction