Sexual Selection and the Psychology of Intergroup Conflict
... over their life span; as a result, increasing the number of sexual partners does not increase reproductive success to the same degree as it does for men. In fact, it can place women at higher risk for harmful consequences of sex—such as those arising from infectious disease and low genetic quality o ...
... over their life span; as a result, increasing the number of sexual partners does not increase reproductive success to the same degree as it does for men. In fact, it can place women at higher risk for harmful consequences of sex—such as those arising from infectious disease and low genetic quality o ...
Sexual selection and temporal phenotypic variation in a damselfly
... plates, which may lead her to reject more extreme males. Moreover, because a female must bend her abdomen up to engage the male’s secondary genitalia, males cannot force females to copulate. A female rejects a male with whom she is in tandem by moving about roughly until the male releases her (Finck ...
... plates, which may lead her to reject more extreme males. Moreover, because a female must bend her abdomen up to engage the male’s secondary genitalia, males cannot force females to copulate. A female rejects a male with whom she is in tandem by moving about roughly until the male releases her (Finck ...
BIOL212lec3APR2012
... • In 1844, Darwin wrote an essay on natural selection as the mechanism of descent with modification, but did not introduce his theory publicly • Natural selection is a process in which individuals with favorable inherited traits are more likely to survive and reproduce • In June 1858, Darwin receiv ...
... • In 1844, Darwin wrote an essay on natural selection as the mechanism of descent with modification, but did not introduce his theory publicly • Natural selection is a process in which individuals with favorable inherited traits are more likely to survive and reproduce • In June 1858, Darwin receiv ...
Questions - Vanier College
... cauliflower. This diversification through selection was possible because: a) the species contained large amounts of genetic variation. b) artificial selection is always possible, whereas natural selection requires much larger population sizes. c) artificial selection is only done on plants that are ...
... cauliflower. This diversification through selection was possible because: a) the species contained large amounts of genetic variation. b) artificial selection is always possible, whereas natural selection requires much larger population sizes. c) artificial selection is only done on plants that are ...
Children and Sexual Abuse
... females do. Some sex therapists believe that girls who do not masturbate miss an important step in their sexual development, since masturbation provides an opportunity to learn how one's body responds to erotic stimulation. Because boys usually masturbate and girls often do not (not true in the Unit ...
... females do. Some sex therapists believe that girls who do not masturbate miss an important step in their sexual development, since masturbation provides an opportunity to learn how one's body responds to erotic stimulation. Because boys usually masturbate and girls often do not (not true in the Unit ...
CHS H Bio Study Guide/Reading Questions for Evolution Chapters
... 5. What is radiometric dating? How is it done? 6. What isotopes are used for recent fossils and very old fossils? 7. If a fossil has 25% of the amount of 14C remaining, how old is the fossil? 8. What are the major divisions in the geological time scale? 9. Look at Figure 19-6. At what “time” did hum ...
... 5. What is radiometric dating? How is it done? 6. What isotopes are used for recent fossils and very old fossils? 7. If a fossil has 25% of the amount of 14C remaining, how old is the fossil? 8. What are the major divisions in the geological time scale? 9. Look at Figure 19-6. At what “time” did hum ...
- Northumbria Research Link
... first day, only one couple turned up, so we said – ‘Well, we’ll work with you and we’ll try and get the other two...’ R: The group mainly comprised of mothers. We very rarely got fathers coming to that, very rarely. Those that did, did not want to be in a group and so we worked with couples who woul ...
... first day, only one couple turned up, so we said – ‘Well, we’ll work with you and we’ll try and get the other two...’ R: The group mainly comprised of mothers. We very rarely got fathers coming to that, very rarely. Those that did, did not want to be in a group and so we worked with couples who woul ...
C. Mechanism: Natural Selection
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
ecological genomics of model eukaryotes1
... genomes. With current sequencing and expression profiling technology, the gap is closing between model and nonmodel species. At present, however, it is only in a handful of model species, where we have the tools to dissect the genetic basis of within species variation in complex traits. Such tools i ...
... genomes. With current sequencing and expression profiling technology, the gap is closing between model and nonmodel species. At present, however, it is only in a handful of model species, where we have the tools to dissect the genetic basis of within species variation in complex traits. Such tools i ...
The Impotence of Darwinism
... It seemed that as pollution increased, the lichens on trees died off and the bark became blackened. The previously camouflaged peppered variety was now conspicuous and the previously conspicuous melanic form was now camouflaged. Birds could more readily see the conspicuous variety and the two forms ...
... It seemed that as pollution increased, the lichens on trees died off and the bark became blackened. The previously camouflaged peppered variety was now conspicuous and the previously conspicuous melanic form was now camouflaged. Birds could more readily see the conspicuous variety and the two forms ...
Colleen Melone Sex and Gender in Greece and Rome Final Paper
... the brothel, or prostitute, with those higher in demand, or known for offering better services, being able to charge more than another location. Another case that can be made against spintriae being used as brothel coins is that negotiating prices seemed to be a fairly usual practice in Roman prost ...
... the brothel, or prostitute, with those higher in demand, or known for offering better services, being able to charge more than another location. Another case that can be made against spintriae being used as brothel coins is that negotiating prices seemed to be a fairly usual practice in Roman prost ...
Diversity in sexual health: Problems and dilemmas
... have to guard their virginity, while boys are allowed to be sexually active. Though virginity at marriage is crucial for Islamic girls, growing up in a western, sexually liberal culture makes it sometimes very difficult to comply with this norm. In a survey study on youth sexuality6, around 10% of 1 ...
... have to guard their virginity, while boys are allowed to be sexually active. Though virginity at marriage is crucial for Islamic girls, growing up in a western, sexually liberal culture makes it sometimes very difficult to comply with this norm. In a survey study on youth sexuality6, around 10% of 1 ...
Secondary sexual ornaments as signals: the handicap approach
... optimization approach(MaynardSmith, 1978), this principle should be used not only as a post-hoc explanation,but mainly as a modelto pursuefurther research.For example,when studying clutch size in ...
... optimization approach(MaynardSmith, 1978), this principle should be used not only as a post-hoc explanation,but mainly as a modelto pursuefurther research.For example,when studying clutch size in ...
Measuring the effect of inbreeding on reproductive success in a
... requirements and mating strategies (Cox & Calsbeek 2009), recently it is known that only some loci experience the fully resolved sexual conflicts to affect sex traits and unlikely resolute throughout the whole genome (Bedhomme & Chippindale 2007). Sexual antagonism stabilized the association between ...
... requirements and mating strategies (Cox & Calsbeek 2009), recently it is known that only some loci experience the fully resolved sexual conflicts to affect sex traits and unlikely resolute throughout the whole genome (Bedhomme & Chippindale 2007). Sexual antagonism stabilized the association between ...
Standard(s)
... understanding the design and procedures used to test a hypothesis, organizing and analyzing data accurately and precisely, producing and interpreting data tables and graphs, performing appropriate calculations, applying basic statistical methods to the data, identifying appropriate conclusions, maki ...
... understanding the design and procedures used to test a hypothesis, organizing and analyzing data accurately and precisely, producing and interpreting data tables and graphs, performing appropriate calculations, applying basic statistical methods to the data, identifying appropriate conclusions, maki ...
ppt - Furman University
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
Sexual Disorders
... Difficult to judge what’s normal/adequate sexual potency, performance, and desire due to variability among individuals, relationship match-ups, & cultural norms Need to take into account age, level of experience, cultural & religious mores, adequacy of sexual stimulation, degree of interpersonal dis ...
... Difficult to judge what’s normal/adequate sexual potency, performance, and desire due to variability among individuals, relationship match-ups, & cultural norms Need to take into account age, level of experience, cultural & religious mores, adequacy of sexual stimulation, degree of interpersonal dis ...
Female Sexual Dysfunction
... fantasies and desire for sexual activity. The judgment of deficiency or absence is made by the clinician, taking into account factors that affect sexual functioning, such as age and the context of the person's life. The disturbance causes marked distress or interpersonal difficulty. The sexual dysfu ...
... fantasies and desire for sexual activity. The judgment of deficiency or absence is made by the clinician, taking into account factors that affect sexual functioning, such as age and the context of the person's life. The disturbance causes marked distress or interpersonal difficulty. The sexual dysfu ...
The evolutionary genetics of personality: Does mutation load signal
... et al., in press). They also live longer (Friedman et al. 1995). Those low in emotional stability (high on neuroticism) have greater difficulty holding jobs and sustaining marriages. Whether these difficulties historically undermined, or currently undermine, reproductive success remains unknown. If a ...
... et al., in press). They also live longer (Friedman et al. 1995). Those low in emotional stability (high on neuroticism) have greater difficulty holding jobs and sustaining marriages. Whether these difficulties historically undermined, or currently undermine, reproductive success remains unknown. If a ...
The Postulated Resemblance of Natural to Artificial Selection
... Artificial selection need scarcely be concerned with the utility of a character to the organism, or even indeed of the general fitness of the latter, while in natural selection, according to theory, utility of characters and general fitness are the ruling factors. This point also is conceded by Darw ...
... Artificial selection need scarcely be concerned with the utility of a character to the organism, or even indeed of the general fitness of the latter, while in natural selection, according to theory, utility of characters and general fitness are the ruling factors. This point also is conceded by Darw ...
Evolutionary Perspectives on Hermaphroditism in Fishes
... mately, male gametes are far more abundant than female gametes. Thus, especially if hermaphrodites can self-fertilize, with regard to reproductive success a pure female in a gynodioecious population should be more competitive than a male in an androdioecious population, assuming that male gametes fr ...
... mately, male gametes are far more abundant than female gametes. Thus, especially if hermaphrodites can self-fertilize, with regard to reproductive success a pure female in a gynodioecious population should be more competitive than a male in an androdioecious population, assuming that male gametes fr ...
EEB 245/Spring 2004 C. Simon First Study Guide, second
... What did Weismann say about somatic versus gonadal (germ) cells? Darwin did not know about Mendel's work because ... What four groups of scientists were working independently at the beginning of the 20th ...
... What did Weismann say about somatic versus gonadal (germ) cells? Darwin did not know about Mendel's work because ... What four groups of scientists were working independently at the beginning of the 20th ...
Chapter 34 Sexuality
... Nikki is educating Ms. Tamika Jones, a 16year-old mother of three, regarding the benefits of practicing safe sex and using effective contraception. Nikki explains to Ms. Jones that sterilization is the most effective birth control measure aside from abstinence. ...
... Nikki is educating Ms. Tamika Jones, a 16year-old mother of three, regarding the benefits of practicing safe sex and using effective contraception. Nikki explains to Ms. Jones that sterilization is the most effective birth control measure aside from abstinence. ...
- CURRENT ZOOLOGY
... suggests that it is the positive association between cognitive abilities and brain size that affects sexual behavior (Miller, 2000, see review by Boogert et al., 2011). Variation in cognitive ability is thought to have a strong impact on individual fitness during mate choice for both the signaler an ...
... suggests that it is the positive association between cognitive abilities and brain size that affects sexual behavior (Miller, 2000, see review by Boogert et al., 2011). Variation in cognitive ability is thought to have a strong impact on individual fitness during mate choice for both the signaler an ...
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.