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Artificial selection on flowering time: influence on reproductive
... warmer climates also result in the selection for earlier reproduction (but see Bradshaw & Holzapfel 2006 for animal studies). Such a pattern of selection would be predicted if observed plastic responses to temperature are adaptive. For example, in Campanulastrum americanum, earlier flowering was foun ...
... warmer climates also result in the selection for earlier reproduction (but see Bradshaw & Holzapfel 2006 for animal studies). Such a pattern of selection would be predicted if observed plastic responses to temperature are adaptive. For example, in Campanulastrum americanum, earlier flowering was foun ...
The genetical theory of multilevel selection - synergy
... the theorem’s logic (cf. Gardner, 2011). These points illustrate the importance of being able to conceptually separate the unit, arena, character and target of selection. Natural selection in class-structured populations If individuals vary in their propensity to achieve reproductive success, for re ...
... the theorem’s logic (cf. Gardner, 2011). These points illustrate the importance of being able to conceptually separate the unit, arena, character and target of selection. Natural selection in class-structured populations If individuals vary in their propensity to achieve reproductive success, for re ...
The genetical theory of multilevel selection
... the theorem’s logic (cf. Gardner, 2011). These points illustrate the importance of being able to conceptually separate the unit, arena, character and target of selection. Natural selection in class-structured populations If individuals vary in their propensity to achieve reproductive success, for re ...
... the theorem’s logic (cf. Gardner, 2011). These points illustrate the importance of being able to conceptually separate the unit, arena, character and target of selection. Natural selection in class-structured populations If individuals vary in their propensity to achieve reproductive success, for re ...
Väinö Meltti: Kotkan Työväenyhdistys 1888-1938
... to be associated with young age and middle class background. Sexual behaviors connected to sexual satisfaction included frequent intercourse, oralgenital sex, experimental lovemaking, and orgasm. Laumann et al. (1994) found there was more emotional satisfaction and physical pleasure in a monogamous ...
... to be associated with young age and middle class background. Sexual behaviors connected to sexual satisfaction included frequent intercourse, oralgenital sex, experimental lovemaking, and orgasm. Laumann et al. (1994) found there was more emotional satisfaction and physical pleasure in a monogamous ...
File - San Marin Science
... similar structures during development all vertebrate embryos have a “gill pouch” at one stage of development ...
... similar structures during development all vertebrate embryos have a “gill pouch” at one stage of development ...
16.2 – Ideas That Shaped Darwin`s Thinking
... selectively using or not using various parts of their bodies. He also suggested that individuals could pass these acquired traits on to their offspring! ...
... selectively using or not using various parts of their bodies. He also suggested that individuals could pass these acquired traits on to their offspring! ...
14_chapter 5
... Turtles have been the subject of numerous morphometric and growth studies. Morphometrics are commonly used to aid in identification of sex as well as age, growth, and other characteristics of turtles such as colour variation (Berry and Shine, 1980; Claude et al., 2003; Lovich et al., 1990). The rela ...
... Turtles have been the subject of numerous morphometric and growth studies. Morphometrics are commonly used to aid in identification of sex as well as age, growth, and other characteristics of turtles such as colour variation (Berry and Shine, 1980; Claude et al., 2003; Lovich et al., 1990). The rela ...
Evolutionary rescue and the limits of adaptation
... It implies that ecological processes can be studied without reference to natural selection, at least to a good approximation, because genetic variation is inadequate to fuel appreciable change in the short term of a few dozen generations. Any species can then be regarded as having a fixed set of att ...
... It implies that ecological processes can be studied without reference to natural selection, at least to a good approximation, because genetic variation is inadequate to fuel appreciable change in the short term of a few dozen generations. Any species can then be regarded as having a fixed set of att ...
Document
... What did Darwin mean by descent? What is a descendant? What is an ancestor? What did he mean by modification? What does it mean to modify something? What did he mean by natural selection? What is nature? What does it mean to select something? ...
... What did Darwin mean by descent? What is a descendant? What is an ancestor? What did he mean by modification? What does it mean to modify something? What did he mean by natural selection? What is nature? What does it mean to select something? ...
Evolutionary Perspectives on Personality
... Sex Differences in Desire for Sexual Variety Sex Differences in Mate Preferences ...
... Sex Differences in Desire for Sexual Variety Sex Differences in Mate Preferences ...
Working with individuals and families where siblings incest has
... offenders. Sibling abusers admitted to more sexual offences, had a longer offending history and a majority engaged in more intrusive sexual behaviour than other adolescent sex offenders. The sibling perpetrator has more access to the victim and exists within a structure of silence and guilt (O'Brien ...
... offenders. Sibling abusers admitted to more sexual offences, had a longer offending history and a majority engaged in more intrusive sexual behaviour than other adolescent sex offenders. The sibling perpetrator has more access to the victim and exists within a structure of silence and guilt (O'Brien ...
Alfred Russel Wallace`s Concepts of Variation
... unpublished material from the period before 1858. It seems clear that at an early age Wallace accepted the mutability of species, and that his travels to various parts of the world were made with the object of finding clues as to how the organic changes occurred. As a result of his specimen collecti ...
... unpublished material from the period before 1858. It seems clear that at an early age Wallace accepted the mutability of species, and that his travels to various parts of the world were made with the object of finding clues as to how the organic changes occurred. As a result of his specimen collecti ...
Review Evolution of Sex: Why Do Organisms Shuffle
... or no resources to their offspring, females pay the full cost of reproduction yet only provide half of each sexually produced offspring’s genes. In contrast, if a female were to produce an offspring asexually, she would transmit twice as many genes at the same energetic cost per offspring. This is t ...
... or no resources to their offspring, females pay the full cost of reproduction yet only provide half of each sexually produced offspring’s genes. In contrast, if a female were to produce an offspring asexually, she would transmit twice as many genes at the same energetic cost per offspring. This is t ...
Modularity, individuality, and evo
... are developmentally coupled, the response to selection for increased size of one individual eyespot can proceed in a manner largely independent from selection imposed on another eyespot. We argue that among-eyespot correlations are unlikely to have constrained the evolutionary diversification of but ...
... are developmentally coupled, the response to selection for increased size of one individual eyespot can proceed in a manner largely independent from selection imposed on another eyespot. We argue that among-eyespot correlations are unlikely to have constrained the evolutionary diversification of but ...
Psychological approaches to the treatment of rapid ejaculation Stanley E. Althof
... Masters and Johnson noted that many men described first sexual experiences characterized by haste and nervousness, for example making love in the backseat of an automobile or during an encounter with a prostitute. Masters and Johnson speculated that the men became conditioned to ejaculate rapidly. I ...
... Masters and Johnson noted that many men described first sexual experiences characterized by haste and nervousness, for example making love in the backseat of an automobile or during an encounter with a prostitute. Masters and Johnson speculated that the men became conditioned to ejaculate rapidly. I ...
The use of multiple cues in mate choice
... environments and signal interaction in the evolution of multiple cues and preferences has received surprisingly little attention but may be of crucial importance. Similarly, sexual conflict has been proposed to result in maladaptive preferences for manipulative cues, and in neutral preferences for th ...
... environments and signal interaction in the evolution of multiple cues and preferences has received surprisingly little attention but may be of crucial importance. Similarly, sexual conflict has been proposed to result in maladaptive preferences for manipulative cues, and in neutral preferences for th ...
File
... endemic to the Galapagos Islands habitats are arid lowland forests and shrubland. generally feeds on seeds, but will also feed on insects and the fruit of cacti. ...
... endemic to the Galapagos Islands habitats are arid lowland forests and shrubland. generally feeds on seeds, but will also feed on insects and the fruit of cacti. ...
variation in mate choice and mating preferences: a review of causes
... unchanged. At present, evidence for stability is based on data that the mean preference function at the population level is unchanged (e.g. Ryan et al., ). However, selection on female choosiness could lead to very different patterns of mate choice. For example, two species could both have audit ...
... unchanged. At present, evidence for stability is based on data that the mean preference function at the population level is unchanged (e.g. Ryan et al., ). However, selection on female choosiness could lead to very different patterns of mate choice. For example, two species could both have audit ...
English - SciELO Colombia
... probability to undertake it. If people perceive themselves as efficient, it’s highly probable to carry it out. This principle from the theory of planned behavior is useful to explain that if a young person perceives him or herself as selfefficient to use a condom in a sexual relation it would be mor ...
... probability to undertake it. If people perceive themselves as efficient, it’s highly probable to carry it out. This principle from the theory of planned behavior is useful to explain that if a young person perceives him or herself as selfefficient to use a condom in a sexual relation it would be mor ...
T4T SIG Summer Institute Natural Selection NGSS Aligned Lesson
... search terms effectively; assess the credibility and accuracy of each source; and quote or paraphrase the data and conclusions of others while avoiding plagiarism and following ...
... search terms effectively; assess the credibility and accuracy of each source; and quote or paraphrase the data and conclusions of others while avoiding plagiarism and following ...
Speciation by Natural and Sexual Selection: Models and Experiments.
... In a random mating population with no natural selection, D evolves to a value of 0. At the other extreme, a value of D of one-fourth represents two populations that are completely reproductively isolated. (For those who would prefer to think about a single diploid locus rather than two haploid loci, ...
... In a random mating population with no natural selection, D evolves to a value of 0. At the other extreme, a value of D of one-fourth represents two populations that are completely reproductively isolated. (For those who would prefer to think about a single diploid locus rather than two haploid loci, ...
15-3 Darwin Presents His Case
... Summary of Darwin's Theory 1. Individual organisms differ, and some of this variation is heritable. 2. Organisms produce more offspring than can survive, and many that do survive do not reproduce. 3. Because more organisms are produced than can survive, they compete for limited resources. Slide 27 o ...
... Summary of Darwin's Theory 1. Individual organisms differ, and some of this variation is heritable. 2. Organisms produce more offspring than can survive, and many that do survive do not reproduce. 3. Because more organisms are produced than can survive, they compete for limited resources. Slide 27 o ...
population genetics - McGraw Hill Higher Education
... natural and experimental populations provided support for their mathematical theories. More recently, population geneticists have used techniques to probe genetic variation at the molecular level. In addition, the staggering improvement in computer technology has aided population geneticists in the ...
... natural and experimental populations provided support for their mathematical theories. More recently, population geneticists have used techniques to probe genetic variation at the molecular level. In addition, the staggering improvement in computer technology has aided population geneticists in the ...
Speciation in rapidly diverging systems: lessons from Lake Malawi
... generally similar in body shape, melanistic body markings and habitat preferences, there are striking differences in their trophic morphology (Reinthal 1990b). The diversification of species during the tertiary radiations is commonly attributed to the divergence of reproductive characters (Fig. 1). ...
... generally similar in body shape, melanistic body markings and habitat preferences, there are striking differences in their trophic morphology (Reinthal 1990b). The diversification of species during the tertiary radiations is commonly attributed to the divergence of reproductive characters (Fig. 1). ...
Sexual selection
![](https://commons.wikimedia.org/wiki/Special:FilePath/Paon_blanc_Madère_2008.jpg?width=300)
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.