on the opportunity for sexual selection, the bateman gradient and
... for a more quantitative view of mating patterns with links to formal selection theory. Early developments along these lines were highly influenced both by Bateman’s (1948) paper and by James Crow’s “opportunity for selection” (Crow 1958). In a simple derivation, Michael Wade (1979) showed that, unde ...
... for a more quantitative view of mating patterns with links to formal selection theory. Early developments along these lines were highly influenced both by Bateman’s (1948) paper and by James Crow’s “opportunity for selection” (Crow 1958). In a simple derivation, Michael Wade (1979) showed that, unde ...
Did Darwin Write the Origin Backwards? Philosophical Essays on
... between realists and conventionalists about the units of selection. Realists think there is some fact of the matter about whether some trait has evolved by group, individual, or genic selection. Conventionalists think it might be useful to describe traits as evolving by group or individual selection ...
... between realists and conventionalists about the units of selection. Realists think there is some fact of the matter about whether some trait has evolved by group, individual, or genic selection. Conventionalists think it might be useful to describe traits as evolving by group or individual selection ...
Darwin`s Dangerous Idea
... 21. When Darwin visited the anatomist Richard Owen and studied the chimpanzee specimen, Darwin said the similarity of bone structure Owen found between the different species was an indicator of _________________________________. 22. Modern scientists have studied the evolution of a specific organ th ...
... 21. When Darwin visited the anatomist Richard Owen and studied the chimpanzee specimen, Darwin said the similarity of bone structure Owen found between the different species was an indicator of _________________________________. 22. Modern scientists have studied the evolution of a specific organ th ...
Meth - WordPress.com
... sometimes violent, and often unprotected sex that meth abusers (“tweakers”) obsess about, hunting for orgasms as they would a gram of meth. For men who are meth addicts, their desire is increased for sex, but their ability to perform is often reduced. “Crystal dick” is the inability to maintain or ...
... sometimes violent, and often unprotected sex that meth abusers (“tweakers”) obsess about, hunting for orgasms as they would a gram of meth. For men who are meth addicts, their desire is increased for sex, but their ability to perform is often reduced. “Crystal dick” is the inability to maintain or ...
Evolution
... 2. Competition Overproduction leads to a struggle. All the organisms compete for food, water, and the other necessities of life. Only those organisms that are well suited to their surroundings survive and reproduce. The rest die. ...
... 2. Competition Overproduction leads to a struggle. All the organisms compete for food, water, and the other necessities of life. Only those organisms that are well suited to their surroundings survive and reproduce. The rest die. ...
Pitchers et al resubmission to Phil Trans Feb2014
... reviews that synthesize these parameters [30-38]. There is considerable variation in the ...
... reviews that synthesize these parameters [30-38]. There is considerable variation in the ...
Defining individual quality over lifetimes and selective contexts
... [13,14]. We argue that understanding the form and intensity of selection operating on traits related to quality is important even if one does not wish to make evolutionary inferences regarding those traits [1], precisely because of the posited close relationship between quality and fitness. The seco ...
... [13,14]. We argue that understanding the form and intensity of selection operating on traits related to quality is important even if one does not wish to make evolutionary inferences regarding those traits [1], precisely because of the posited close relationship between quality and fitness. The seco ...
Finding Our Place in the Great Chain of Being
... flippers? Why do so many vertebrate species in general share a common body plan, with varying degrees of modification to that plan? Why do so many plant species share similar structural plans? Why do these similarities exist? And why do all life forms share the same genetic code? The biologist also ...
... flippers? Why do so many vertebrate species in general share a common body plan, with varying degrees of modification to that plan? Why do so many plant species share similar structural plans? Why do these similarities exist? And why do all life forms share the same genetic code? The biologist also ...
Charles Robert Darwin was a famous scientist and naturalist who first
... According to Funk and Wagnalls New Encyclopedia Charles Darwin was a, “British scientist, who laid the foundation of modern evolutionary theory with his concept of the development of all forms of life through the slow-working process of natural selection.” (Darwin, Charles Robert, Funk and Wagnalls) ...
... According to Funk and Wagnalls New Encyclopedia Charles Darwin was a, “British scientist, who laid the foundation of modern evolutionary theory with his concept of the development of all forms of life through the slow-working process of natural selection.” (Darwin, Charles Robert, Funk and Wagnalls) ...
Ch 15-2 Notes
... A. 1798, Proposes that the human population will continue to grow exponentially without the interference of outside forces. B. The only forces that could work against the growth were: ...
... A. 1798, Proposes that the human population will continue to grow exponentially without the interference of outside forces. B. The only forces that could work against the growth were: ...
Bisexuality: It is Complicated
... and stable orientation among a significant fraction of the population, sexologists were studying the phenomenon. Over a century ago, Freud wrote (1905: 261–262): It is well known that at all times there have been, as there still are, human beings who can take as their sexual objects persons of either ...
... and stable orientation among a significant fraction of the population, sexologists were studying the phenomenon. Over a century ago, Freud wrote (1905: 261–262): It is well known that at all times there have been, as there still are, human beings who can take as their sexual objects persons of either ...
Female sexual dysfunction after pelvic surgery
... after laparoscopic than open surgery in men, but there was no such difference in women. It is evident from published reports that sexual dysfunction is a significant problem after radical rectal surgery, and was often under-reported, especially in women. The introduction of screening programmes (fec ...
... after laparoscopic than open surgery in men, but there was no such difference in women. It is evident from published reports that sexual dysfunction is a significant problem after radical rectal surgery, and was often under-reported, especially in women. The introduction of screening programmes (fec ...
Evolution and Ecology
... evolves major new adaptations. Stems and waxy cuticles provided early terrestrial plants with support against gravity and protection from desiccation. These increases in diversity over a short time period are called adaptive ...
... evolves major new adaptations. Stems and waxy cuticles provided early terrestrial plants with support against gravity and protection from desiccation. These increases in diversity over a short time period are called adaptive ...
Darwin`s Books - Winchester College
... directed by humans. Further, that mankind was itself a domesticated species and subject to the same processes. For all its empirical impregnability, Origin lacked a mechanism to demonstrate the ‘strong principle of ...
... directed by humans. Further, that mankind was itself a domesticated species and subject to the same processes. For all its empirical impregnability, Origin lacked a mechanism to demonstrate the ‘strong principle of ...
The Role of Coloration in Mate Choice and Sexual
... In studies of sexual signaling, the GEI of special interest is that relating to genetic variance for the acquisition of phenotypic ‘‘condition,’’ which is, in turn, signaled by the ornament. Thus, individuals of high genetic quality, that is, in possession of ‘‘good genes,’’ are able to attain high ...
... In studies of sexual signaling, the GEI of special interest is that relating to genetic variance for the acquisition of phenotypic ‘‘condition,’’ which is, in turn, signaled by the ornament. Thus, individuals of high genetic quality, that is, in possession of ‘‘good genes,’’ are able to attain high ...
Chapter 8 Evolution at multiple loci: linkage and
... Ultimately, asexual reproduction should take over. However, in nature this is not the case. Most organisms reproduce sexually and both sexual and asexual modes of reproduction are used in many organisms ...
... Ultimately, asexual reproduction should take over. However, in nature this is not the case. Most organisms reproduce sexually and both sexual and asexual modes of reproduction are used in many organisms ...
New York State Descriptions/Penalties for Sex Offenses
... S 130.45 Criminal sexual act in the second degree. A person is guilty of criminal sexual act in the second degree when: 1. being eighteen years old or more, he or she engages in oral sexual conduct or anal sexual conduct with another person less than fifteen years old; or 2. he or she engages in or ...
... S 130.45 Criminal sexual act in the second degree. A person is guilty of criminal sexual act in the second degree when: 1. being eighteen years old or more, he or she engages in oral sexual conduct or anal sexual conduct with another person less than fifteen years old; or 2. he or she engages in or ...
How one man`s observations and ideas helped
... likely to survive and have the chance to reproduce, therefore passing on their useful adaptations to the next generation. Those individuals that are the least well adapted do not survive long enough to breed. These ideas formed the basis of Darwin’s theory of evolution by natural selection. ...
... likely to survive and have the chance to reproduce, therefore passing on their useful adaptations to the next generation. Those individuals that are the least well adapted do not survive long enough to breed. These ideas formed the basis of Darwin’s theory of evolution by natural selection. ...
bYTEBoss PPT_2.7.12.evolution2
... Silently and on your own, complete the task below When you are finished, put your pencil down and look up. Remain silent to allow others to finish. ...
... Silently and on your own, complete the task below When you are finished, put your pencil down and look up. Remain silent to allow others to finish. ...
Slide 1
... the birds came to the island from the main land. The birds beaks changed over time to best suit the birds needs in terms of its available diet on each island. ...
... the birds came to the island from the main land. The birds beaks changed over time to best suit the birds needs in terms of its available diet on each island. ...
The Price Had Better Be Right - Carlson School of Management
... & Rutter, 1998). Gender differences in the costs of sex emerge in part from gender differences in parental investment costs (Symons, 1979; Trivers, 1972). That is, the inherent contribution to reproduction is simply larger and more sustained over time for women as compared with men, which makes wome ...
... & Rutter, 1998). Gender differences in the costs of sex emerge in part from gender differences in parental investment costs (Symons, 1979; Trivers, 1972). That is, the inherent contribution to reproduction is simply larger and more sustained over time for women as compared with men, which makes wome ...
Kinseyan Anthropology
... my research on child pornography at the “British Psychological Association Conference on Love and Attraction” in 1976. Although all three agents work together, this chapter focuses on group B; “Kinsey’s disciples in sexology” and the allied discipline of anthropology. Kinsey Legitimizes the Sexual ...
... my research on child pornography at the “British Psychological Association Conference on Love and Attraction” in 1976. Although all three agents work together, this chapter focuses on group B; “Kinsey’s disciples in sexology” and the allied discipline of anthropology. Kinsey Legitimizes the Sexual ...
The Darwinian Revolution
... genetic contest in which each gains a temporary genetic advantage over the other. This often happens between predators and prey species. Or results in symbioses ...
... genetic contest in which each gains a temporary genetic advantage over the other. This often happens between predators and prey species. Or results in symbioses ...
6 - BHU
... For this purpose various autosomal and sex-linked genes have been utilised. The results obtained indicate that the frequencies of mutant types declined rapidly in subsequent generations (Hertier and Teissier 1934, Merrell 1953, Reed and Reed 1950). Experiments in several species of Drosophila have a ...
... For this purpose various autosomal and sex-linked genes have been utilised. The results obtained indicate that the frequencies of mutant types declined rapidly in subsequent generations (Hertier and Teissier 1934, Merrell 1953, Reed and Reed 1950). Experiments in several species of Drosophila have a ...
Chp 22 Descent with Modification and Darwin
... Geographical distribution was particularly confusing in the case of the fauna of the Galapagos, recently formed volcanic islands which lie on the equator about 900 km west of South America. ï Most animal species on the Galapagos are unique to those islands, but resemble species living on the South A ...
... Geographical distribution was particularly confusing in the case of the fauna of the Galapagos, recently formed volcanic islands which lie on the equator about 900 km west of South America. ï Most animal species on the Galapagos are unique to those islands, but resemble species living on the South A ...
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.