OTHER WORDS FROM scienceThis delineation also tends to be observed in technical and medical contexts, with the term sex referring to biological forms in such phrases as sex hormones , sex organs , and biological sex. 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. The investigation of natural phenomena through observation, theoretical explanation, and experimentation, or the knowledge produced by such investigation.
As a rule, male and female complement each other at all levels of organization: as sex cells; as individuals with either testes or ovaries; and as individuals with anatomical, physiological, and behavioral differences associated with the complemental roles they play during the whole reproductive process. Some fungi, including baker's yeast , have mating types that create a duality similar to male and female roles. What Does 'Sapiosexual' Mean?
One proposed explanation for this is the handicap principle. Thus, XX mammals are female and XY are male. Seminars in Cell and Developmental Biology. Such species are called monoecious "one house" or hermaphroditic.
Sexual and nonsexual reproduction Because the life span of all individual forms of life, from microbes to man , is limited, the first concern of any particular population is to produce successors. The observation, identification, description, experimental investigation, and theoretical explanation of phenomena. Play the game. This process of cell division is called mitosis.
Meiosis", U. A science dictionary includes many technical terms with precise, specialized meanings—terms not normally found in general dictionaries—making it an invaluable resource for students and professionals in scientific fields. New York: Garland Science.
Alberts, B. All rights reserved. Take the quiz Syn City Build a city of skyscrapers—one synonym at a time.
Sexthe sum of features definitoon which eSx of species can be divided into two groups—male and female—that complement each other reproductively. Sex, sexualityand reproduction are all closely woven into the fabric of living things.
All relate to the propagation of the race and the survival of the species. Because the life span of all individual forms of life, from microbes to man Essex county jeff lemire, is limited, the first concern of any particular population is to produce successors.
This is reproduction, pure and simple. Among lower animals and plants it may be accomplished without involving eggs and sperm. Fernsfor example, shed millions of microscopic, nonsexual spores, which are capable of definiiton into new plants if they defiition in a suitable environment. Many higher plants also reproduce by nonsexual means.
Bulbs bud off new bulbs from the side. Certain jellyfish, sea anemones, marine worms, and other lowly creatures Sexuelles verlangen off parts of the body during one season or another, each thereby giving rise to populations of new, though identical, individuals.
All such reproduction depends on the capacity of cells to grow and divide, which is a basic property of life. Such so-called vegetative forms of reproduction, whether of animals or plants, result in individuals that are genetically identical with the parent. If some adverse environmental change should occur, all would be equally eefinition and none might sxience.
At the best, therefore, nonsexual reproduction can be a valuable and perhaps an essential means of propagation, but it scisnce not exclude the need for sexual reproduction.
Sexual reproduction not only takes care of the need for replacement of individuals within a population but gives rise to populations better suited to survive under changing circumstances. In effect it is a kind of double assurance that the race or species will persist for an indefinite time. Sex definition science great difference between the two types of reproduction is that individual organisms resulting from nonsexual reproduction have but a single parent and are essentially alike, whereas those resulting from sexual reproduction have two parents and are never exact replicas of either.
Sexual reproduction thus introduces a variability, in addition to its propagative function. Both types of reproduction derinition the capacity of individual cells to develop into whole organisms, given suitable circumstances. Sex is therefore something that has been combined with this primary function and is responsible for the capacity of a race to adapt to new environmental conditions.
The term sex is variously employed. In the broad sense it includes everything from the sex cells to sexual behaviour. Dfeinition sexwhich is generally all that distinguishes one kind of individual from another in the case scienec many lower animals, denotes the capacity of the reproductive gland, or gonadto produce either sperm ecience or eggs or both. If only sperm cells are produced, the reproductive gland is a testisand the primary sex of the tissue Denise nackt the individual possessing it is male.
If only eggs are produced, the reproductive gland is an ovaryand the primary sex is female. If the gland produces both sperm and eggs, either simultaneously or successively, the condition is known as hermaphroditic. An individual, sccience, is male or female or hermaphrodite primarily according to the nature of the gonad. As a rule, male and female complement each other at all levels of organization: as sex cells; as individuals with either testes or ovaries; and as individuals with anatomical, physiological, and behavioral differences associated with the complemental roles they play during the whole reproductive process.
The role of the male individual is to deliver sperm cells in enormous numbers Sex definition science the right place and at the right time to fertilize eggs of female individuals of the same species.
The role of the female individual is to deliver or otherwise offer eggs capable of being fertilized under precise circumstances. Such cells will be genetically different to a significant degree, and it is this feature that is essential to the long-term well-being of the race.
The other sexual distinctions, between the two types of sex cell and between two individuals of different sex, are secondary differences connected with ways and means of attaining the end. Article Media. Info Print Print. Table Of Contents. Submit Feedback. Thank you for your feedback. Introduction Sexual and dsfinition reproduction Sex cells Sexuality: complementary mating types The adaptive significance of sex Reproduction and evolution Life cycles adjusted to environmental change The origin of sex and sexuality Differentiation of the sexes Mating Mating modifications imposed by the land environment Sexual anatomy Courtship Sex patterns Sex differences in animals Seasonal Intelligence is sexy facebook periodic sexual cycles Sex determination Sex chromosomes Abnormal chromosome effects Parthenogenesis Effects cefinition environment Hormones.
Written By: N. James deen sex Article History.
Sexual and nonsexual reproduction Because the life span drfinition all individual forms of life, from microbes to manis limited, definitiob first concern of any particular population is to produce successors. Sciece exclusive access to content from our First Edition with your subscription.
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Science | Definition of Science at emrahkara.info. Sex definition science
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Sex/gender influence health and disease, and considering these factors in research informs the development of prevention strategies and treatment interventions for both men and women. "Sex" refers to biological differences between females and males, including chromosomes, sex organs, and endogenous hormonal profiles. Sex, the sum of features by which members of species can be divided into two groups—male and female—that complement each other reproductively.. Sex, sexuality, and reproduction are all closely woven into the fabric of living emrahkara.info relate to the propagation of the race and the survival of the species. Yet there can be sex without sexuality, and reproduction need not be sexual, although. Oct 31, · Debra W. Soh holds a PhD in sexual neuroscience research from York University and writes about the science and politics of sex. Her writing has appeared in .