sex in Biological Definition
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sex in Biological Definition
... types of cell reproduction
2.2 Why we have sex
3 Related articles
Cell size
... the 22 autosomes and the special category of sex chromosomes . There are two distinct sex chromosomes, the X chromosome and the Y ...
... The Descent of Man and Selection in Relation to sex and followed up by The Expression of Emotions ... The Descent of Man and Selection in Relation to sex 1872 – The Expression of Emotions in ... The Descent of Man, and Selection in Relation to sex (London: Penguin Classics, 2004). (Detailed ...
... one set of chromosomes from each parent), though sex cells ( sperm and oocytes ) are haploid. In ... . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote ... are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome ...
... one set of chromosomes from each parent), though sex cells ( sperm and oocytes ) are haploid. In ... . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote ... are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome ...
... 2 Causes of deviation 3 Derivation 4 sex linkage 5 Generalizations 5.1 ... equilibrium is reached in two generations. sex linkage Where the a gene is sex-linked , the heterogametic sex (e.g. males in humans) have only one copy of the ...
... hermaphrodite : The organism is born as one sex and later changes into the other sex. ... : When the organism starts as a male, and changes sex to a female later in life. Example: The ... fishes. The populations are generally changing sex at a smaller size, due to natural selection . ...
... chromosomes : (22 pairs of autosomes , and 2 sex chromosomes ). At present estimate, humans have ... , or pygmy chimpanzee. [7] Humans have an XY sex determination system , so that females have the sex chromosomes XX and males have XY. The X ...
... vertically, without recombination caused by sex . Exclusive vertical transfer occurs when the ... Muller's ratchet is an important theory as to why sex evolved, but works better in small populations ... exclusive. Any discussion on the evolution of sex should include a discussion of the Muller's ...
... Maynard Smith, John. (1978). The Evolution of sex . Cambridge: Cambridge University Press. ISBN ... & Levin, Bruce R. (1988). The Evolution of sex . Sunderland, Mass: Sinauer Associates. ISBN ... Sunnucks, Paul. (2002). Ecology and evolution of sex in aphids. Trends in Ecology & Evolution, 17 ...
... evolutionary theory explaining the advantage of sex . By making every individual an experiment when mixing mother's and father's genes , sex may allow a species to adapt quickly just to hold ... level of the gene by positing that the role of sex is to preserve genes which are currently ...
... twins 1.2 Identical twins 1.2.1 Mixed sex identical twins 1.3 Semi-identical twins ... are observed separately or together. Mixed sex identical twins In extremely rare cases, ... a Y chromosome to trigger the production of male sex hormones , this fetus develops as a girl by ...
... The X chromosome is one of the two sex chromosomes in humans and other animals (the ... 3 References Function The sex chromosomes are one of the 23 pairs of human ... in cells. Each person normally has one pair of sex chromosomes in each cell. Females have two X ...
... The Y chromosome is one of the two sex chromosomes in humans (the other is the X chromosome ). The sex chromosomes are one of the 23 pairs of human ... to trace parental lineage. It is one of two sex chromosomes ; it contains the genes that cause ...
... In those species in which sex is determined by the presence of the Y or W chromosome rather than the ... species. These genes are generally those which are present on the other sex chromosome (Y or W). Mechanism Mammalian X-chromosome inactivation ...
... selection occurs when organisms that are more attractive to the opposite sex because of their features reproduce more and increase the frequency of ... medicine endosymbiont evolutionary algorithm evolution of sex evolutionary tree experimental evolution ...
... macroscopically visible aspects of an individual's genotype , such as sex (XX vs. XY pair). The study of karyotypes is known as karyology . ... ). However, some individuals have other karyotypes with added or missing sex chromosomes, including 47,XYY , 47,XXY , 47,XXX and 45,X . The other ...
... similar thing, e.g. photocopying and the making of replicas . It is perhaps most commonly used in the context of biological reproduction and sex : Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These ...
... in humans, there are 22 pairs of autosomes. The X and Y chromosomes are not autosomal. Non-autosomal chromosomes are usually referred to as sex chromosomes or, less frequently, as gonosomes. Uses An autosomal dominant gene is one on an autosome and is always expressed, even if a ...
... habit, religion and the integration and interdependence of culture traits. For example, men and women have complementary roles in many cultures. One sex might desire changes that affect the other, as happened in the second half of the 20th century in western cultures. Cultural change can be caused ...
... along the anterior-posterior axis of the developing embryo. The Antennapedia group of homeotic selector genes includes labial , antennapedia , sex combs reduced , deformed , and proboscipedia . Labial and Deformed proteins are expressed in head segments where they activate the genes that ...
... article for publication details) Charles Darwin (1859) The Origin of Species and (1871) The Descent of Man and Selection in Relation to sex Ronald Fisher (1930) The Genetical Theory of Natural Selection John Maynard Smith and Ers Szathmry (1997) The Major Transitions ...
... Gametes (in Greek : γαμέτες ) —also known as sex cells, germ cells, or spores —are the specialized cells that come together during fertilization (conception) in organisms that reproduce ...
... on the prevalence of the disease in a given area. In low prevalence areas, such as the continental United States, IV drug abuse and unprotected sex are the primary method. In moderate prevalence areas, the disease is predominantly spread among children. In high prevalence countries, such as ...
... the distorted human figure drawn to reflect the relative sensory space our body parts represent on the cerebral cortex . The lips, hands, feet and sex organs are considerably more sensitive than other parts of the body, so the homunculus has grossly large lips, hands and genitals. Well known in the ...
... thyrotropin-releasing hormone (TRH) Steroid hormones : Glucocorticoids cortisol Mineralocorticoids aldosterone sex steroids Androgens testosterone dehydroepiandrosterone (DHEA) dehydroepiandrosterone sulfate (DHEAS) androstenedione ...
... Klinefelter's syndrome is a condition caused by a chromosome abnormality in males (specifically, a nondisjunction ); sufferers have a pair of X sex chromosomes instead of just one. It is named after Harry Klinefelter , the medical researcher who first described this syndrome in 1942 . Human ...
... 0300013531 Margulis, Lynn, 1982, Early Life , Science Books International, ISBN 0867200057 Margulis, Lynn and Dorion Sagan, 1986, Origins of sex : Three Billion Years of Genetic Recombination , Yale University Press, ISBN 0300033400 Margulis, Lynn and Dorion Sagan, 1987, Microcosmos: Four ...
... along the anterior-posterior axis of the developing embryo. The Antennapedia group of homeotic selector genes includes labial , antennapedia , sex combs reduced , deformed , and proboscipedia . Labial and Deformed proteins are expressed in head segments where they activate the genes that ...
... more likely to play an important role in cases where selection for adaptation is continuous. For example, the Red Queen hypothesis suggests that sex might have evolved to help organisms adapt to deal with parasites. Natural selection can be expressed as the following general law (taken from the ...
... in a given geographic area . Population is studied in a wide variety of ways and disciplines. In population dynamics , size, age and sex structure, mortality, reproductive behaviour, and growth of a population are studied. Demography is the study of human population dynamics. ...
... ( spermatozoa ) and noncellular compartment ( seminal plasma ). It contains the sperm , which sometimes results in pregnancy following vaginal sex with a female . Semen is a whitish , milky fluid, very viscous , containing water and small amounts of salt , protein , and fructose . ...
... similar thing, e.g. photocopying and the making of replicas . It is perhaps most commonly used in the context of biological reproduction and sex : Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These ...
... A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female ) or "XY" (for a male ). Sperm cells were first ...
... enough to be able to divide into two embryos, making identical twins , or in rare cases, merge with another blastocyst, even one of the opposite sex [1] , to create a chimera , an individual comprised of populations of cells with two different sets of DNA . From the biological point of view, ...
... and dog were quite similar to those from man. The mean temperature of the female was higher than that of the male in all the species examined whose sex had been determined. Meals sometimes cause a slight elevation, sometimes a slight depression—alcohol seems always to produce a fall. Exercise ...
... males displayed the white-eyed trait. From this, he concluded that (1) some traits were sex-linked , (2) the trait was probably carried on the sex chromosome (ie the X and Y chromosomes), and (3) other genes were probably carried on specific chromosomes as well. He and his students counted the ...
... sleep ? Or dream , come to that? What are the inheritable characterisitics of intelligence ? What are the correlations between intelligence and sex ? Is intelligence affected by the geomagnetic field ? Bioelectromagnetism : What are the mechanisms of biorhythms and chronobiology ? Why ...
... The Descent of Man and Selection in Relation to sex and followed up by The Expression of Emotions ... The Descent of Man and Selection in Relation to sex 1872 – The Expression of Emotions in ... The Descent of Man, and Selection in Relation to sex (London: Penguin Classics, 2004). (Detailed ...
... one set of chromosomes from each parent), though sex cells ( sperm and oocytes ) are haploid. In ... . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote ... are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome ...
... one set of chromosomes from each parent), though sex cells ( sperm and oocytes ) are haploid. In ... . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote ... are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome ...
... 2 Causes of deviation 3 Derivation 4 sex linkage 5 Generalizations 5.1 ... equilibrium is reached in two generations. sex linkage Where the a gene is sex-linked , the heterogametic sex (e.g. males in humans) have only one copy of the ...
... hermaphrodite : The organism is born as one sex and later changes into the other sex. ... : When the organism starts as a male, and changes sex to a female later in life. Example: The ... fishes. The populations are generally changing sex at a smaller size, due to natural selection . ...
... chromosomes : (22 pairs of autosomes , and 2 sex chromosomes ). At present estimate, humans have ... , or pygmy chimpanzee. [7] Humans have an XY sex determination system , so that females have the sex chromosomes XX and males have XY. The X ...
... vertically, without recombination caused by sex . Exclusive vertical transfer occurs when the ... Muller's ratchet is an important theory as to why sex evolved, but works better in small populations ... exclusive. Any discussion on the evolution of sex should include a discussion of the Muller's ...
... Maynard Smith, John. (1978). The Evolution of sex . Cambridge: Cambridge University Press. ISBN ... & Levin, Bruce R. (1988). The Evolution of sex . Sunderland, Mass: Sinauer Associates. ISBN ... Sunnucks, Paul. (2002). Ecology and evolution of sex in aphids. Trends in Ecology & Evolution, 17 ...
... evolutionary theory explaining the advantage of sex . By making every individual an experiment when mixing mother's and father's genes , sex may allow a species to adapt quickly just to hold ... level of the gene by positing that the role of sex is to preserve genes which are currently ...
... twins 1.2 Identical twins 1.2.1 Mixed sex identical twins 1.3 Semi-identical twins ... are observed separately or together. Mixed sex identical twins In extremely rare cases, ... a Y chromosome to trigger the production of male sex hormones , this fetus develops as a girl by ...
... The X chromosome is one of the two sex chromosomes in humans and other animals (the ... 3 References Function The sex chromosomes are one of the 23 pairs of human ... in cells. Each person normally has one pair of sex chromosomes in each cell. Females have two X ...
... The Y chromosome is one of the two sex chromosomes in humans (the other is the X chromosome ). The sex chromosomes are one of the 23 pairs of human ... to trace parental lineage. It is one of two sex chromosomes ; it contains the genes that cause ...
... In those species in which sex is determined by the presence of the Y or W chromosome rather than the ... species. These genes are generally those which are present on the other sex chromosome (Y or W). Mechanism Mammalian X-chromosome inactivation ...
... selection occurs when organisms that are more attractive to the opposite sex because of their features reproduce more and increase the frequency of ... medicine endosymbiont evolutionary algorithm evolution of sex evolutionary tree experimental evolution ...
... macroscopically visible aspects of an individual's genotype , such as sex (XX vs. XY pair). The study of karyotypes is known as karyology . ... ). However, some individuals have other karyotypes with added or missing sex chromosomes, including 47,XYY , 47,XXY , 47,XXX and 45,X . The other ...
Neutral theory of molecular evolution
... organisms, the nucleotide substitution must arise within one of the many sex cells that an individual carries. Then only if that sex cell participates in the genesis of an embryo and offspring does the ...... similar thing, e.g. photocopying and the making of replicas . It is perhaps most commonly used in the context of biological reproduction and sex : Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These ...
... in humans, there are 22 pairs of autosomes. The X and Y chromosomes are not autosomal. Non-autosomal chromosomes are usually referred to as sex chromosomes or, less frequently, as gonosomes. Uses An autosomal dominant gene is one on an autosome and is always expressed, even if a ...
... habit, religion and the integration and interdependence of culture traits. For example, men and women have complementary roles in many cultures. One sex might desire changes that affect the other, as happened in the second half of the 20th century in western cultures. Cultural change can be caused ...
... along the anterior-posterior axis of the developing embryo. The Antennapedia group of homeotic selector genes includes labial , antennapedia , sex combs reduced , deformed , and proboscipedia . Labial and Deformed proteins are expressed in head segments where they activate the genes that ...
... article for publication details) Charles Darwin (1859) The Origin of Species and (1871) The Descent of Man and Selection in Relation to sex Ronald Fisher (1930) The Genetical Theory of Natural Selection John Maynard Smith and Ers Szathmry (1997) The Major Transitions ...
... Gametes (in Greek : γαμέτες ) —also known as sex cells, germ cells, or spores —are the specialized cells that come together during fertilization (conception) in organisms that reproduce ...
... on the prevalence of the disease in a given area. In low prevalence areas, such as the continental United States, IV drug abuse and unprotected sex are the primary method. In moderate prevalence areas, the disease is predominantly spread among children. In high prevalence countries, such as ...
... the distorted human figure drawn to reflect the relative sensory space our body parts represent on the cerebral cortex . The lips, hands, feet and sex organs are considerably more sensitive than other parts of the body, so the homunculus has grossly large lips, hands and genitals. Well known in the ...
... thyrotropin-releasing hormone (TRH) Steroid hormones : Glucocorticoids cortisol Mineralocorticoids aldosterone sex steroids Androgens testosterone dehydroepiandrosterone (DHEA) dehydroepiandrosterone sulfate (DHEAS) androstenedione ...
... Klinefelter's syndrome is a condition caused by a chromosome abnormality in males (specifically, a nondisjunction ); sufferers have a pair of X sex chromosomes instead of just one. It is named after Harry Klinefelter , the medical researcher who first described this syndrome in 1942 . Human ...
... 0300013531 Margulis, Lynn, 1982, Early Life , Science Books International, ISBN 0867200057 Margulis, Lynn and Dorion Sagan, 1986, Origins of sex : Three Billion Years of Genetic Recombination , Yale University Press, ISBN 0300033400 Margulis, Lynn and Dorion Sagan, 1987, Microcosmos: Four ...
... along the anterior-posterior axis of the developing embryo. The Antennapedia group of homeotic selector genes includes labial , antennapedia , sex combs reduced , deformed , and proboscipedia . Labial and Deformed proteins are expressed in head segments where they activate the genes that ...
... more likely to play an important role in cases where selection for adaptation is continuous. For example, the Red Queen hypothesis suggests that sex might have evolved to help organisms adapt to deal with parasites. Natural selection can be expressed as the following general law (taken from the ...
... in a given geographic area . Population is studied in a wide variety of ways and disciplines. In population dynamics , size, age and sex structure, mortality, reproductive behaviour, and growth of a population are studied. Demography is the study of human population dynamics. ...
... ( spermatozoa ) and noncellular compartment ( seminal plasma ). It contains the sperm , which sometimes results in pregnancy following vaginal sex with a female . Semen is a whitish , milky fluid, very viscous , containing water and small amounts of salt , protein , and fructose . ...
... similar thing, e.g. photocopying and the making of replicas . It is perhaps most commonly used in the context of biological reproduction and sex : Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These ...
... A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female ) or "XY" (for a male ). Sperm cells were first ...
... enough to be able to divide into two embryos, making identical twins , or in rare cases, merge with another blastocyst, even one of the opposite sex [1] , to create a chimera , an individual comprised of populations of cells with two different sets of DNA . From the biological point of view, ...
... and dog were quite similar to those from man. The mean temperature of the female was higher than that of the male in all the species examined whose sex had been determined. Meals sometimes cause a slight elevation, sometimes a slight depression—alcohol seems always to produce a fall. Exercise ...
... males displayed the white-eyed trait. From this, he concluded that (1) some traits were sex-linked , (2) the trait was probably carried on the sex chromosome (ie the X and Y chromosomes), and (3) other genes were probably carried on specific chromosomes as well. He and his students counted the ...
... sleep ? Or dream , come to that? What are the inheritable characterisitics of intelligence ? What are the correlations between intelligence and sex ? Is intelligence affected by the geomagnetic field ? Bioelectromagnetism : What are the mechanisms of biorhythms and chronobiology ? Why ...
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(Date:11/30/2009)...vailable in German . , The DFG has approved...h Centres as of 1 January 2010. This decision was ...Bonn. The new centres will initially be funded for...on, 20 percent overhead funding for indirect costs...es, research topics range from modern prostheses t...
(Date:11/30/2009)...2009) Scientists and engineers from two of the na...ll come together Dec. 7 with leading academicians ... blood. , Much like moving oil through a pipelin...th systems need clean, well-functioning pipes (or ... function efficiently. Both industries also are cr...
(Date:11/30/2009)...he inaugural Global Conference on Systems & Enterp...shington, DC, focuses on the convergence of comple...importance to society. , The goal of the con...ty around targeted complex systems, examined by do...ludes Critical Infrastructure Systems, including I...
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