- Wiley Online Library
... Understanding how often natural selection directly favors speciation, a process known as reinforcement, has remained an outstanding problem for over 70 years. Although reinforcement has been strongly criticized in the past, it is once again seen as more realistic due to the seminal discovery of enha ...
... Understanding how often natural selection directly favors speciation, a process known as reinforcement, has remained an outstanding problem for over 70 years. Although reinforcement has been strongly criticized in the past, it is once again seen as more realistic due to the seminal discovery of enha ...
Disorders of Orgasm and Ejaculation in Men
... anorgasmia may have a biogenic and/or psychogenic atiology. Men with age-related penile hypoanesthesia should be educated, reassured, and instructed in revised sexual techniques which maximize arousal. Conclusions. Additional research is required to further the understanding of the disorders of ejac ...
... anorgasmia may have a biogenic and/or psychogenic atiology. Men with age-related penile hypoanesthesia should be educated, reassured, and instructed in revised sexual techniques which maximize arousal. Conclusions. Additional research is required to further the understanding of the disorders of ejac ...
Adaptive Speciation: Epilogue
... gets it and we all get over it” (Bush 1998). Indeed, it is now the widely accepted common wisdom that most evolutionary diversification occurred according to the allopatric speciation scenario. However, even though allopatric speciation, with its apparent simplicity, is an intuitively appealing idea ...
... gets it and we all get over it” (Bush 1998). Indeed, it is now the widely accepted common wisdom that most evolutionary diversification occurred according to the allopatric speciation scenario. However, even though allopatric speciation, with its apparent simplicity, is an intuitively appealing idea ...
Neutral Evolution and Aesthetics
... activity that synthesizes already existing elements according to known laws. This would correspond to the aspect of directionality. However, if a work of art were completely directional it would be too predictable. Art must also involve essentially unpredictable activity that while conforming to mec ...
... activity that synthesizes already existing elements according to known laws. This would correspond to the aspect of directionality. However, if a work of art were completely directional it would be too predictable. Art must also involve essentially unpredictable activity that while conforming to mec ...
Complementation, Genetic Conflict, and the
... divisions (endomitosis), by fusion of meiotic products after the 2 divisions (automixis) or by the suppression of one division (meiotic apomixis). Therefore, I have listed all plausible types including meiotic apomixis in which the second division is skipped, because it is plausible in principle, al ...
... divisions (endomitosis), by fusion of meiotic products after the 2 divisions (automixis) or by the suppression of one division (meiotic apomixis). Therefore, I have listed all plausible types including meiotic apomixis in which the second division is skipped, because it is plausible in principle, al ...
Complementation, genetic conflict, and the evolution of sex
... divisions (endomitosis), by fusion of meiotic products after the 2 divisions (automixis) or by the suppression of one division (meiotic apomixis). Therefore, I have listed all plausible types including meiotic apomixis in which the second division is skipped, because it is plausible in principle, al ...
... divisions (endomitosis), by fusion of meiotic products after the 2 divisions (automixis) or by the suppression of one division (meiotic apomixis). Therefore, I have listed all plausible types including meiotic apomixis in which the second division is skipped, because it is plausible in principle, al ...
Darwin`s Finches and Natural Selection in the Galapagos
... on what beak would me the most or least effective for picking up seeds. We then got to test it out and see the results for ourselves. After, we got to make conclusions about what we saw happen, and state if our hypothesis was correct or incorrect. The theory of Natural Selection explains that animal ...
... on what beak would me the most or least effective for picking up seeds. We then got to test it out and see the results for ourselves. After, we got to make conclusions about what we saw happen, and state if our hypothesis was correct or incorrect. The theory of Natural Selection explains that animal ...
EliasLambert_uta_2502D_12091
... age group (Bureau of Justice Statistics, 1992). Findings such as these underscore the fact that college-age women are a high-risk group for sexual violence. Sexual violence encompasses both rape and sexual assault. Rape is legally defined as any type of intercourse without consent. This includes vag ...
... age group (Bureau of Justice Statistics, 1992). Findings such as these underscore the fact that college-age women are a high-risk group for sexual violence. Sexual violence encompasses both rape and sexual assault. Rape is legally defined as any type of intercourse without consent. This includes vag ...
Nabokov, Teleology, and Insect Mimicry
... could ever prove the existence of a transcendent intelligence that devised the aesthetic and telic laws of form and function. Aesthetic and teleological phenomena only seem to the reflective judgment to be indicative of a divine designer. Nabokov's attitude is Kantian when he writes in this oft-quo ...
... could ever prove the existence of a transcendent intelligence that devised the aesthetic and telic laws of form and function. Aesthetic and teleological phenomena only seem to the reflective judgment to be indicative of a divine designer. Nabokov's attitude is Kantian when he writes in this oft-quo ...
Adaptive speciation: the role of natural selection in mechanisms of
... standard usage, I call both approaches accounts of Ôadaptive speciationÕ, because natural selection drives the evolution of reproductive isolation in both cases.10 Controversies about adaptive speciation are traditionally discussed in the context of geography.11 Advocates of the spandrel approach ar ...
... standard usage, I call both approaches accounts of Ôadaptive speciationÕ, because natural selection drives the evolution of reproductive isolation in both cases.10 Controversies about adaptive speciation are traditionally discussed in the context of geography.11 Advocates of the spandrel approach ar ...
Document
... in the current environment are present in excess at the reproductive age and therefore contribute disproportionately to the offspring of the next generation. • For natural selection to operate there must be heritable variation for traits that are correlated with reproductive success. ...
... in the current environment are present in excess at the reproductive age and therefore contribute disproportionately to the offspring of the next generation. • For natural selection to operate there must be heritable variation for traits that are correlated with reproductive success. ...
Maternal effects and evolution at ecological time
... change, occurring over ‘ecological’ time-scales such as years, decades or centuries (Thompson 1998; Hendry & Kinnison 1999; Hairston et al. 2005). In essence, ‘maternal effects’ can be defined as any aspect of the mother’s phenotype that affects her offspring’s’ phenotype. Consequently, not all mate ...
... change, occurring over ‘ecological’ time-scales such as years, decades or centuries (Thompson 1998; Hendry & Kinnison 1999; Hairston et al. 2005). In essence, ‘maternal effects’ can be defined as any aspect of the mother’s phenotype that affects her offspring’s’ phenotype. Consequently, not all mate ...
A validation and reduced form of the Female Condom Attitudes Scale
... original database. The investigator draws a substantial number of bootstrap samples (e.g., 2000) of size N from the original data. In any given sample, some cases may appear multiple times whereas other cases may not be selected at all. Thus, there is variation among the bootstrap samples. The boots ...
... original database. The investigator draws a substantial number of bootstrap samples (e.g., 2000) of size N from the original data. In any given sample, some cases may appear multiple times whereas other cases may not be selected at all. Thus, there is variation among the bootstrap samples. The boots ...
... (Oxford English Dictionary 1989, s.v.mascle). However, we've learned that females bear offspring and have breasts for them to suckle, whereas males beget the offspring. At the root of these definitions are the features which distinguish male from female, collectively known as sexual dimorphisms. In ...
Managing the Media Monster: The Influence of Media
... positive and negative ways—teen sexual knowledge, attitudes, and behavior. Importantly, the report also offers practical suggestions for how those working with youth can use the media to reach young people and provides suggestions on how best to capitalize on the exploding world of digital media. A ...
... positive and negative ways—teen sexual knowledge, attitudes, and behavior. Importantly, the report also offers practical suggestions for how those working with youth can use the media to reach young people and provides suggestions on how best to capitalize on the exploding world of digital media. A ...
Managing the Media Monster - California STD/HIV Prevention
... positive and negative ways—teen sexual knowledge, attitudes, and behavior. Importantly, the report also offers practical suggestions for how those working with youth can use the media to reach young people and provides suggestions on how best to capitalize on the exploding world of digital media. A ...
... positive and negative ways—teen sexual knowledge, attitudes, and behavior. Importantly, the report also offers practical suggestions for how those working with youth can use the media to reach young people and provides suggestions on how best to capitalize on the exploding world of digital media. A ...
Divergent Evolution through Cumulative Segregation.
... been distributed in their several localities. In answering these questions, we find it difficult to point to any of those active causes of accumulated variation, classed by Darwin as Piatural Selection. . . . . There is no reason t o doubt that some varieties less fitted to survive have disappeared; ...
... been distributed in their several localities. In answering these questions, we find it difficult to point to any of those active causes of accumulated variation, classed by Darwin as Piatural Selection. . . . . There is no reason t o doubt that some varieties less fitted to survive have disappeared; ...
this PDF file - Journal of the Oxford Centre for Buddhist
... for being homosexuality.” In fact, it must be added that the modern concept of sexual orientation did not exist, so was not an issue in ancient Indian minds. Regarding the social attitude of the time, John Powers describes: “ere are several stories of monks having sexual encounters with other men, ...
... for being homosexuality.” In fact, it must be added that the modern concept of sexual orientation did not exist, so was not an issue in ancient Indian minds. Regarding the social attitude of the time, John Powers describes: “ere are several stories of monks having sexual encounters with other men, ...
Reconceptualising Evolution by Natural Selection
... results from entities exhibiting differences in fitness in a population), this conceals a number of theoretical ambiguities and difficulties. Some of these have been pointed out numerous times; others have hardly been noticed. One aim of this work is to unpack these difficulties and ambiguities; ano ...
... results from entities exhibiting differences in fitness in a population), this conceals a number of theoretical ambiguities and difficulties. Some of these have been pointed out numerous times; others have hardly been noticed. One aim of this work is to unpack these difficulties and ambiguities; ano ...
Marty Ferris
... enough that it must have been shaped by selection.' This seems like a pretty fuzzy way of determining when this criterion can be used or not. They return to this discussion at the end of the paper (pg. 13) where they give well known examples of adaptive morphological plasticity. These are convincing ...
... enough that it must have been shaped by selection.' This seems like a pretty fuzzy way of determining when this criterion can be used or not. They return to this discussion at the end of the paper (pg. 13) where they give well known examples of adaptive morphological plasticity. These are convincing ...
Let`s Face the Music and Dance - International Body Psychotherapy
... examined erotic transference as a phenomenon that occurs when the patient openly declares that she has ‘fallen in love’ with the analyst. Hence, erotic transference is a theoretical construct from which to understand erotic charge and sexual feelings in therapy. More recently, erotic transference ha ...
... examined erotic transference as a phenomenon that occurs when the patient openly declares that she has ‘fallen in love’ with the analyst. Hence, erotic transference is a theoretical construct from which to understand erotic charge and sexual feelings in therapy. More recently, erotic transference ha ...
Murdering Darwin`s Child—Toward an Intelligent Evolution and a
... Darwin came to the Beagle under no particular financial constraint or expectation, Wallace was, at least in part, in this for the money. Thus Wallace tended to collect twice: once for the museum and collector trade, the other for his own scientific collection. Because numbers were of the essence, Wa ...
... Darwin came to the Beagle under no particular financial constraint or expectation, Wallace was, at least in part, in this for the money. Thus Wallace tended to collect twice: once for the museum and collector trade, the other for his own scientific collection. Because numbers were of the essence, Wa ...
The Flamingo`s Smile - A Website About Stephen Jay Gould`s
... out-competing other males of the same species for the opportunity to mate (e.g., big antlers), or by directly appealing to the preferences of individual females who could choose among several suitors (e.g., peacock tails). Darwin called this evolutionary mechanism sexual selection. Natural selection ...
... out-competing other males of the same species for the opportunity to mate (e.g., big antlers), or by directly appealing to the preferences of individual females who could choose among several suitors (e.g., peacock tails). Darwin called this evolutionary mechanism sexual selection. Natural selection ...
empirical evidence for bet hedging Modes of response to
... trait variance is seen as requiring an explanation, whereas conservative traits are not readily identifiable. Clearly defining bet hedging may help prevent confusion, but its relationship with the other modes of response is also a source of misinterpretation. The difference between evolutionary trac ...
... trait variance is seen as requiring an explanation, whereas conservative traits are not readily identifiable. Clearly defining bet hedging may help prevent confusion, but its relationship with the other modes of response is also a source of misinterpretation. The difference between evolutionary trac ...
An Examination of the Relationship between Disordered Eating and
... One explanation for the patterns seen in both sexual behavior and eating disorders could be mood disturbance1. Carter et al. (2007) compared women with anorexia nervosa, women with depression, and women who had recently had a baby (post-partum - within two months following birth) for sexual function ...
... One explanation for the patterns seen in both sexual behavior and eating disorders could be mood disturbance1. Carter et al. (2007) compared women with anorexia nervosa, women with depression, and women who had recently had a baby (post-partum - within two months following birth) for sexual function ...
Sexual selection
Sexual selection is a mode of natural selection where typically members of one gender choose mates of the other gender to mate with, called intersexual selection, and where females normally do the choosing, and competition between members of the same gender to sexually reproduce with members of the opposite sex, called intrasexual selection. These two forms of selection mean that some individuals have better reproductive success than others within a population either from being sexier or preferring sexier partners to produce offspring. For instance in the breeding season sexual selection in frogs occurs with the males first gathering at the water's edge and croaking. The females then arrive and choose the males with the deepest croaks and best territories. Generalizing, males benefit from frequent mating and monopolizing access to a group of fertile females. Females have a limited number of offspring they can have and they maximize the return on the energy they invest in reproduction.First articulated by Charles Darwin who described it as driving speciation and that many organisms had evolved features whose function was deleterious to their individual survival, and then developed by Ronald Fisher in the early 20th century. Sexual selection can lead typically males to extreme efforts to demonstrate their fitness to be chosen by females, producing secondary sexual characteristics, such as ornate bird tails like the peacock plumage, or the antlers of deer, or the manes of lions, caused by a positive feedback mechanism known as a Fisherian runaway, where the passing on of the desire for a trait in one sex is as important as having the trait in the other sex in producing the runaway effect. Although the sexy son hypothesis indicates that females would prefer male sons, Fisher's principle explains why the sex ratio is 1:1 almost without exception. Sexual selection is also found in plants and fungi.The maintenance of sexual reproduction in a highly competitive world has long been one of the major mysteries of biology given that asexual reproduction can reproduce much more quickly as 50% of offspring are not males, unable to produce offspring themselves. However, research published in 2015 indicates that sexual selection can explain the persistence of sexual reproduction.