GAME PLAN Origin of Species Erasmus Darwin
... If theorem 1 is true and postulate 2 is true it follows that those individuals with traits that allow them to survive more frequently will produce offspring that share those traits and therefore over time those traits will become more common in the population. ...
... If theorem 1 is true and postulate 2 is true it follows that those individuals with traits that allow them to survive more frequently will produce offspring that share those traits and therefore over time those traits will become more common in the population. ...
Sexuality and obsessive-compulsive disorder: the hidden affair
... current sexual obsessions were more likely to report aggressive and religious obsessions (as reported by other authors [25,26] ). Moreover, they also found that patients with sexual obsessions reported an earlier age of onset of OCD (15.1 ± 5.6 years) compared with subjects without them (19.0 ± 10.3 ...
... current sexual obsessions were more likely to report aggressive and religious obsessions (as reported by other authors [25,26] ). Moreover, they also found that patients with sexual obsessions reported an earlier age of onset of OCD (15.1 ± 5.6 years) compared with subjects without them (19.0 ± 10.3 ...
Document
... appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animal and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved and unfavorable ones to be destroyed." ...
... appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animal and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved and unfavorable ones to be destroyed." ...
CONVERGENT EVOLUTION OF SEXUAL DIMORPHISM IN SKULL
... When considering morphometric traits, sexual dimorphism may occur in both size and shape. Sexual size and shape dimorphism often have unique developmental origins and ecological significance and are thus best considered separately in comparative analyses. Although size dimorphism has been studied in ...
... When considering morphometric traits, sexual dimorphism may occur in both size and shape. Sexual size and shape dimorphism often have unique developmental origins and ecological significance and are thus best considered separately in comparative analyses. Although size dimorphism has been studied in ...
1 - Introduction
... tremendous variety of modern species being descended from a common ancestor. ...
... tremendous variety of modern species being descended from a common ancestor. ...
Steffey, S.K., Gibson, B.W., & Dula, C. S. (2011, March). Childhood
... experiences (Allen, 1995; Davis, 1996; Davis & Frawley, 1994; Herman, 1992; Rogers, 1995). Limitations • Though it is plausible that childhood maltreatment causes adulthood depression, the nature of correlational research prohibits making such a statement. Additionally, the sample was relatively hom ...
... experiences (Allen, 1995; Davis, 1996; Davis & Frawley, 1994; Herman, 1992; Rogers, 1995). Limitations • Though it is plausible that childhood maltreatment causes adulthood depression, the nature of correlational research prohibits making such a statement. Additionally, the sample was relatively hom ...
An evolutionary behaviorist - Portsmouth Research Portal
... as the Smoke Detector Principle (Nesse, 2001). If there are two kinds of errors an organism can make, evolution will bias behavior toward the less costly of these errors. If you design a smoke alarm, it’s better for it to be calibrated to go off in error when there is no fire than it is for it to re ...
... as the Smoke Detector Principle (Nesse, 2001). If there are two kinds of errors an organism can make, evolution will bias behavior toward the less costly of these errors. If you design a smoke alarm, it’s better for it to be calibrated to go off in error when there is no fire than it is for it to re ...
Formation of vestigial organs
... known to be advantageous, then it cannot be assumed that they are being selected for in the first place. This means the reduction of useless structures on the basis of indirect selection is called into question, since the premise of the argument, that a favorable trait is being selected for, is also ...
... known to be advantageous, then it cannot be assumed that they are being selected for in the first place. This means the reduction of useless structures on the basis of indirect selection is called into question, since the premise of the argument, that a favorable trait is being selected for, is also ...
puberty or passion? the referent of υπερακμος in 1
... ταύταις ὑπέρακμοις πρὸ τῆς διακορήσεως ἀθροῦν ἐπιφαίνεται, 1.22).18 Later he makes it clear that the time to begin sexual intercourse is after the onset of puberty which, he observed, was at the age of fourteen, outlining the risks for those who have intercourse before menstruation begins (1.33). Th ...
... ταύταις ὑπέρακμοις πρὸ τῆς διακορήσεως ἀθροῦν ἐπιφαίνεται, 1.22).18 Later he makes it clear that the time to begin sexual intercourse is after the onset of puberty which, he observed, was at the age of fourteen, outlining the risks for those who have intercourse before menstruation begins (1.33). Th ...
Density cycles and an offspring quantity and quality game driven by
... In contrast, yellow females laying large eggs had more progeny that survived to maturity than those laying small eggs. Throat colour was heritable between dams and daughters (h2 0:48, F 1;116 6:92, P 0:001). Dam's throat colour was also genetically correlated with daughter's clutch size (Gt;s ...
... In contrast, yellow females laying large eggs had more progeny that survived to maturity than those laying small eggs. Throat colour was heritable between dams and daughters (h2 0:48, F 1;116 6:92, P 0:001). Dam's throat colour was also genetically correlated with daughter's clutch size (Gt;s ...
4 Natural Selection and Variation
... limited resources of food, or space. An organism competes most closely with other members of its own species, because they have the most similar ecological needs to its own. Other species, in decreasing order of ecological similarity, also compete and exert a negative influence on the organism’s cha ...
... limited resources of food, or space. An organism competes most closely with other members of its own species, because they have the most similar ecological needs to its own. Other species, in decreasing order of ecological similarity, also compete and exert a negative influence on the organism’s cha ...
CHAPTER 3 ORGANIC CHEMISTRY
... Darwin and Wallace’s theories were not immediately accepted because meiosis, genes, and inheritance were poorly understood. Mendel’s discovery provided an explanation for how characteristics could be transmitted from one generation to the next. Knowledge of mutation, gene flow and reproductive isola ...
... Darwin and Wallace’s theories were not immediately accepted because meiosis, genes, and inheritance were poorly understood. Mendel’s discovery provided an explanation for how characteristics could be transmitted from one generation to the next. Knowledge of mutation, gene flow and reproductive isola ...
Theory and speciation
... isolation, mechanical isolation based on male genitalia, and postmating, prezygotic isolation (such as sperm–egg incompatibility) is, in principle, straightforward. If two geographically isolated lineages diverge in male traits and female preferences, they are likely to be sexually isolated when the ...
... isolation, mechanical isolation based on male genitalia, and postmating, prezygotic isolation (such as sperm–egg incompatibility) is, in principle, straightforward. If two geographically isolated lineages diverge in male traits and female preferences, they are likely to be sexually isolated when the ...
Theory and speciation
... isolation, mechanical isolation based on male genitalia, and postmating, prezygotic isolation (such as sperm–egg incompatibility) is, in principle, straightforward. If two geographically isolated lineages diverge in male traits and female preferences, they are likely to be sexually isolated when the ...
... isolation, mechanical isolation based on male genitalia, and postmating, prezygotic isolation (such as sperm–egg incompatibility) is, in principle, straightforward. If two geographically isolated lineages diverge in male traits and female preferences, they are likely to be sexually isolated when the ...
Sample pages 4 PDF
... range from 26 to 32◦ C. With turtles it is the high temperature that gives only females, except for the snapping turtle which is like the crocodile. The temperatures that produce all male or all female hatchlings vary little between the different species of crocodilia. Females are produced at one or ...
... range from 26 to 32◦ C. With turtles it is the high temperature that gives only females, except for the snapping turtle which is like the crocodile. The temperatures that produce all male or all female hatchlings vary little between the different species of crocodilia. Females are produced at one or ...
How to prepare your patient for the many
... Although a patient may be granted “permission” to engage in coital activity, other variables influence her decision. It is well known that sexual desire may fluctuate during pregnancy and typically decreases significantly during the third trimester.2 Many women enter the postpartum period with lower ...
... Although a patient may be granted “permission” to engage in coital activity, other variables influence her decision. It is well known that sexual desire may fluctuate during pregnancy and typically decreases significantly during the third trimester.2 Many women enter the postpartum period with lower ...
Descent with Modification-A Darwinian View of Life
... slow, continuous actions rather than from sudden events, then Earth must be much older than the widely accepted age of a few thousand years. It would, for example, take a very long time for a river to carve a canyon by erosion. He later reasoned that perhaps similarly slow and subtle processes could ...
... slow, continuous actions rather than from sudden events, then Earth must be much older than the widely accepted age of a few thousand years. It would, for example, take a very long time for a river to carve a canyon by erosion. He later reasoned that perhaps similarly slow and subtle processes could ...
Descent with Modification: A Darwinian View of Life
... such adaptations was essential to understanding evolution. As we’ll explore further, his explanation of how adaptations arise centered on natural selection, a process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because ...
... such adaptations was essential to understanding evolution. As we’ll explore further, his explanation of how adaptations arise centered on natural selection, a process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because ...
are African elephants sexually segregated at the habitat scale?
... opportunities, in order to maximize growth and their reproductive potential, which is limited by competitive access to receptive mates (Clutton-Brock & Harvey, 1978; McElligott et al., 2001). In contrast, females invest disproportionately more energy and time into reproduction and the weaning of the ...
... opportunities, in order to maximize growth and their reproductive potential, which is limited by competitive access to receptive mates (Clutton-Brock & Harvey, 1978; McElligott et al., 2001). In contrast, females invest disproportionately more energy and time into reproduction and the weaning of the ...
The Evidence for Evolution
... Size. The first horses were no bigger than dogs, with some considerably smaller. By contrast, modern equids can weigh more than a half ton. Examination of the fossil record reveals that horses changed little in size for their first 30 million years, but since then, a number of different lineages exh ...
... Size. The first horses were no bigger than dogs, with some considerably smaller. By contrast, modern equids can weigh more than a half ton. Examination of the fossil record reveals that horses changed little in size for their first 30 million years, but since then, a number of different lineages exh ...
A pluralist approach to sex and recombination
... been put to several different uses, or lost (e.g. gill arches, mammalian forelimbs). The factors maintaining sexual reproduction may be different from those which led to its evolution. Multiple selection pressures are the norm in evolutionary biology: for instance, we do not expect, nor do we ®nd, t ...
... been put to several different uses, or lost (e.g. gill arches, mammalian forelimbs). The factors maintaining sexual reproduction may be different from those which led to its evolution. Multiple selection pressures are the norm in evolutionary biology: for instance, we do not expect, nor do we ®nd, t ...
Psychosocial and Biological Treatment Considerations for the
... identified as high risk.48 Although the efficacy of treatment practices for sex offenders has been questioned and viewed at best as equivocal in the past, more recent research using improved methodologies suggests that even in its broad application, current sex offender treatment approaches appear t ...
... identified as high risk.48 Although the efficacy of treatment practices for sex offenders has been questioned and viewed at best as equivocal in the past, more recent research using improved methodologies suggests that even in its broad application, current sex offender treatment approaches appear t ...
Charles R. Darwin 1809-1882
... It was noted that both animals and plants produce more offspring that ever survive. These organisms must struggle to survive and the survivors have some characteristic/s that give them an advantage and ability to cope with the conditions they encounter. ...
... It was noted that both animals and plants produce more offspring that ever survive. These organisms must struggle to survive and the survivors have some characteristic/s that give them an advantage and ability to cope with the conditions they encounter. ...
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.