File - Mr. Shanks` Class
... typically those which have the greatest number of facial features average to any particular culture/race. ...
... typically those which have the greatest number of facial features average to any particular culture/race. ...
EVOLUTIONARY EXPLANATIONS OF GENDER File
... • Describe parental investments made by males and females • Explain how behavioural differences may have been linked to reproductive success • Understand the criticisms that have been made of the evolutionary account of gender differences ...
... • Describe parental investments made by males and females • Explain how behavioural differences may have been linked to reproductive success • Understand the criticisms that have been made of the evolutionary account of gender differences ...
Evo Notes 2b
... • Females are attracted to males with larger, dark manes • Correlation with higher testosterone levels ...
... • Females are attracted to males with larger, dark manes • Correlation with higher testosterone levels ...
miller inpress sexencyc - The University of New Mexico
... Sex differences in bodies and brains are usually the result of sexual selection. Male mammals can produce offspring just by having sex for a few minutes if they find a willing female, whereas female mammals can only produce offspring if they get pregnant for a long time and produce milk for their of ...
... Sex differences in bodies and brains are usually the result of sexual selection. Male mammals can produce offspring just by having sex for a few minutes if they find a willing female, whereas female mammals can only produce offspring if they get pregnant for a long time and produce milk for their of ...
doc Order code 81730063 Topic explaining sexual selection with
... Course Date Sexual selection: Theory and Analysis Charles Darwin initially suggested that secondary sexual characteristics exhibited by male organisms such as bright plumage in some birds or mane in an African lion (Panthera leo), developed since females favored mating with males that had such chara ...
... Course Date Sexual selection: Theory and Analysis Charles Darwin initially suggested that secondary sexual characteristics exhibited by male organisms such as bright plumage in some birds or mane in an African lion (Panthera leo), developed since females favored mating with males that had such chara ...
Project description - Norwich Research Park
... reproductive traits (Darwin’s theory), or indeed that it does not change the genome, but works via differential expression. It is important to understand how sexual selection works, not just because it concerns every species on earth, but also because we need to quantify the importance of this proce ...
... reproductive traits (Darwin’s theory), or indeed that it does not change the genome, but works via differential expression. It is important to understand how sexual selection works, not just because it concerns every species on earth, but also because we need to quantify the importance of this proce ...
Lecture 6
... Lecture 6: Sexual selection; learning and evolution Sexual selection: This phenomenon was first suggested by Darwin, especially in his book, The Descent of Man. Sexual selection occurs when (phenotypic) traits are selected because they are attractive to members of the opposite sex. Often such traits ...
... Lecture 6: Sexual selection; learning and evolution Sexual selection: This phenomenon was first suggested by Darwin, especially in his book, The Descent of Man. Sexual selection occurs when (phenotypic) traits are selected because they are attractive to members of the opposite sex. Often such traits ...
Sexual Selection
... There are 2 selection pressures on gametes: (1) larger zygotes improves zygote survival (2) more gametes increases chances of fertilization As resources for reproduction become limiting, these 2 pressures oppose one another – the compromise solution is the evolution of 2 different sexes, one produci ...
... There are 2 selection pressures on gametes: (1) larger zygotes improves zygote survival (2) more gametes increases chances of fertilization As resources for reproduction become limiting, these 2 pressures oppose one another – the compromise solution is the evolution of 2 different sexes, one produci ...
Lecture 3
... recurring problems... faced by our ancestors. Would the challenges of mate choice have been the same for ancestral males and females? Theory of sexual selection says probably not. Male reproductive success is less limited than female reproductive success. ...
... recurring problems... faced by our ancestors. Would the challenges of mate choice have been the same for ancestral males and females? Theory of sexual selection says probably not. Male reproductive success is less limited than female reproductive success. ...
A1992HE20900001
... of those for females, involved probing. Later,acomparablestudyofacontinentalwoodpecker in which bill length is only 9 percent dimorphic showed relatively minor dffferences in feeding behavior. This paper, and T.W. Schoenar’s rep~rt,~ in 1957, of sexual differences in microhabitat occurrence and inse ...
... of those for females, involved probing. Later,acomparablestudyofacontinentalwoodpecker in which bill length is only 9 percent dimorphic showed relatively minor dffferences in feeding behavior. This paper, and T.W. Schoenar’s rep~rt,~ in 1957, of sexual differences in microhabitat occurrence and inse ...
natural selection
... “neighborhood” promotes inbreeding Assortative mating – mate with others like themselves . This is the premise behind artificial selection. ...
... “neighborhood” promotes inbreeding Assortative mating – mate with others like themselves . This is the premise behind artificial selection. ...
DISRUPTING GENETIC EQUILIBRIUM
... Hardy-Weinberg Principles To stay in equilibrium: No natural selection No mutations No gene flow Infinitely large population Mating is random ...
... Hardy-Weinberg Principles To stay in equilibrium: No natural selection No mutations No gene flow Infinitely large population Mating is random ...
Mating Systems
... Traits that improve reproductive success have been selected during the course of evolution, especially among males, primarily via intrasexual selection Examples: sexual attractive adornments, antler, horns, enlarged canine teeth and other masculine weaponry Such features also provide info to fem ...
... Traits that improve reproductive success have been selected during the course of evolution, especially among males, primarily via intrasexual selection Examples: sexual attractive adornments, antler, horns, enlarged canine teeth and other masculine weaponry Such features also provide info to fem ...
Evolution exam 1 File
... c) conjugation d) good genes hypothesis e) postzygotic endomitotic isolation f) hybrid incompatibility g) paternal infertility h) runaway selection hypotheses i) immunocompetence j) anisogamy 1. Extravagant traits indicate biological fitness (because less fit males would be less able to afford such ...
... c) conjugation d) good genes hypothesis e) postzygotic endomitotic isolation f) hybrid incompatibility g) paternal infertility h) runaway selection hypotheses i) immunocompetence j) anisogamy 1. Extravagant traits indicate biological fitness (because less fit males would be less able to afford such ...
View PDF
... For relative fitness of a specific allele, take into account: a) complete genetic context b) complete environmental context allele is expressed in. Alleles that do no harm/benefit may be perpetuated in individuals with high overall fitness. Ex. Transposable elements and old retroviruses that have be ...
... For relative fitness of a specific allele, take into account: a) complete genetic context b) complete environmental context allele is expressed in. Alleles that do no harm/benefit may be perpetuated in individuals with high overall fitness. Ex. Transposable elements and old retroviruses that have be ...
What is an advantage of sexual reproduction
... Mating (takes energy, time, resources, can be damaging) Genetic (only half of genes are passed to offspring, esp. costly for the female) Cost of producing males (males don’t produce eggs or do parental care usually. Females are the limiting resource in terms of population growth, this is a numerical ...
... Mating (takes energy, time, resources, can be damaging) Genetic (only half of genes are passed to offspring, esp. costly for the female) Cost of producing males (males don’t produce eggs or do parental care usually. Females are the limiting resource in terms of population growth, this is a numerical ...
Natural Selection
... Instead of traits that help survival, they are traits to help reproduce Usually hurts ability to survive Two types Male competition Weapons for combat Large Size ...
... Instead of traits that help survival, they are traits to help reproduce Usually hurts ability to survive Two types Male competition Weapons for combat Large Size ...
Recent research reveals
... offspring that have them and these offspring, because they are less fit, will not pass on the deleterious genes to future generations. • Offspring that lack the deleterious genes have higher fitness and do not pass on deleterious genes to future generations. ...
... offspring that have them and these offspring, because they are less fit, will not pass on the deleterious genes to future generations. • Offspring that lack the deleterious genes have higher fitness and do not pass on deleterious genes to future generations. ...
Types of Sexual Selection
... Sexual selection leads to features that don’t help an individual ______________, but enhances their ____________________ success ...
... Sexual selection leads to features that don’t help an individual ______________, but enhances their ____________________ success ...
Sexual Selection in Plants?
... by resources. Male reproduction more often limited by access to mates. If the variance in male success is higher than female success then there is an opportunity for sexual selection to affect male characters that increase their ability to obtain mates. ...
... by resources. Male reproduction more often limited by access to mates. If the variance in male success is higher than female success then there is an opportunity for sexual selection to affect male characters that increase their ability to obtain mates. ...
Which of the following is NOT a component of the Theory of
... as Darwin is to _____ a. divergence of related species b. homologous structures c. evolution by natural selection d. speciation by common descent ...
... as Darwin is to _____ a. divergence of related species b. homologous structures c. evolution by natural selection d. speciation by common descent ...
Evolution & Speciation
... colonization by a limited number of individuals from a parent population ...
... colonization by a limited number of individuals from a parent population ...
Sexual Selection
... with each other to be chosen. Victorian science was not very PC. Darwin often caricatured his observations by stating that females were coy by nature and males were eager, or aggressive, when it came to mating. ...
... with each other to be chosen. Victorian science was not very PC. Darwin often caricatured his observations by stating that females were coy by nature and males were eager, or aggressive, when it came to mating. ...
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.