Sex, sociality and behavior (social behavior)
... How can sexually selected traits indicate individual quality? • The handicap principle suggests that elaborate male secondary sexual characteristics act as handicaps since they are costly to produce and bear. • Females will prefer to mate with males that confer higher quality to their progeny – Exa ...
... How can sexually selected traits indicate individual quality? • The handicap principle suggests that elaborate male secondary sexual characteristics act as handicaps since they are costly to produce and bear. • Females will prefer to mate with males that confer higher quality to their progeny – Exa ...
Evolution Quiz Week 6
... Why does sexual reproduction persist o Enhanced adaptive evolution by recombination o Breaks up bad combinations of genes, or deleterious mutations o Advantageous mutations are combined across lineages Asexual spp are typically at the tips of phylogenetic trees, because there is a large short term b ...
... Why does sexual reproduction persist o Enhanced adaptive evolution by recombination o Breaks up bad combinations of genes, or deleterious mutations o Advantageous mutations are combined across lineages Asexual spp are typically at the tips of phylogenetic trees, because there is a large short term b ...
Exam 1 - Evergreen Archives
... 4. Some people believe that species, like individual organisms, have life cycles. They believe that species are born by a process of speciation, grow and expand, and inevitably die out as a result of “species old age.” Could any of the agents of evolution cause such a species life cycle? If not, ho ...
... 4. Some people believe that species, like individual organisms, have life cycles. They believe that species are born by a process of speciation, grow and expand, and inevitably die out as a result of “species old age.” Could any of the agents of evolution cause such a species life cycle? If not, ho ...
Chapter 7.1 , 7.2, and 7.3
... Evolution is the process in which inherited characteristics within a population change over generations, sometimes developing into new species. Scientists continue to develop theories to explain how evolution happens. Evidence that organisms evolve can be found by comparing living organisms to ...
... Evolution is the process in which inherited characteristics within a population change over generations, sometimes developing into new species. Scientists continue to develop theories to explain how evolution happens. Evidence that organisms evolve can be found by comparing living organisms to ...
here - My Haiku
... Match the vocabulary term in the table above with the phrase below that best defines it. Each term will be used only once. 1. _____________________ When natural selection favors an extreme trait (ex. longer beaks) 2. _____________________ When an ancestral species evolves into multiple species 3. __ ...
... Match the vocabulary term in the table above with the phrase below that best defines it. Each term will be used only once. 1. _____________________ When natural selection favors an extreme trait (ex. longer beaks) 2. _____________________ When an ancestral species evolves into multiple species 3. __ ...
Answer Key evolution study guide
... B. Males will often compete with one another to mate with females. C. Males will often show flashy traits to attract females into mating with them. D.No animals put effort into mating. Having offspring is not important. E. B & C are both correct ...
... B. Males will often compete with one another to mate with females. C. Males will often show flashy traits to attract females into mating with them. D.No animals put effort into mating. Having offspring is not important. E. B & C are both correct ...
Evolution Quiz Study Guide
... Fossil record - composed of the millions of fossils scientists have found ...
... Fossil record - composed of the millions of fossils scientists have found ...
Evolution II
... indicate biological fitness (because less fit males would be less able to afford such traits). • One special case of this hypotheses is that such traits indicate ability to cope with parasites. • “Runaway selection hypotheses” – females prefer sexually attractive traits which they pass on to sons, w ...
... indicate biological fitness (because less fit males would be less able to afford such traits). • One special case of this hypotheses is that such traits indicate ability to cope with parasites. • “Runaway selection hypotheses” – females prefer sexually attractive traits which they pass on to sons, w ...
Evolution - charlestonbiology
... Intrasexual selection, in which males compete for territory or access to females, or areas on mating grounds where displays take place. Male-male competition can lead to intense battles for access to females where males use elaborate armaments (e.g., horns of many ungulates). ...
... Intrasexual selection, in which males compete for territory or access to females, or areas on mating grounds where displays take place. Male-male competition can lead to intense battles for access to females where males use elaborate armaments (e.g., horns of many ungulates). ...
Evolution by Natural Selection
... Did you know… Darwin never even used the word Evolution in his book? He preferred “Descent with Modification.” So what does that mean? ...
... Did you know… Darwin never even used the word Evolution in his book? He preferred “Descent with Modification.” So what does that mean? ...
NaturalSelection - San Elijo Elementary School
... Their children would also have the useful traits ...
... Their children would also have the useful traits ...
eandb-essay-1 15 kb eandb-essay
... ways. The theory of Natural selection was first put forward by Charles Darwin and Alfred Russell Wallace in their 1859 publication, ‘On the origin of species’, it aims to explain how certain biological traits change in frequency over time due to the struggle for existence of organisms. Natural selec ...
... ways. The theory of Natural selection was first put forward by Charles Darwin and Alfred Russell Wallace in their 1859 publication, ‘On the origin of species’, it aims to explain how certain biological traits change in frequency over time due to the struggle for existence of organisms. Natural selec ...
Natural Selection - David Brotherton CCCMC
... the populations become genetically different. Behavioral Isolation • Results from differences in behaviors, such as choosing to migrate at different times that prevent mating. • Selection of nonrandom mates results in genetic variation Natural Selection: The nonrandom process by which biologic trait ...
... the populations become genetically different. Behavioral Isolation • Results from differences in behaviors, such as choosing to migrate at different times that prevent mating. • Selection of nonrandom mates results in genetic variation Natural Selection: The nonrandom process by which biologic trait ...
psy 3f3 2010 Class 4 notes
... selection (e.g. by predation) opposes. (e.g. antlers for fighting, peacocks’ tails for courting). But antagonistic selective pressures aren’t peculiar to sexual selection. Any trait under selection has both costs & benefits, and will proliferate if and only if its benefits exceed its costs. Traits t ...
... selection (e.g. by predation) opposes. (e.g. antlers for fighting, peacocks’ tails for courting). But antagonistic selective pressures aren’t peculiar to sexual selection. Any trait under selection has both costs & benefits, and will proliferate if and only if its benefits exceed its costs. Traits t ...
Selection
... Biology 1B – Evolution Lecture 6 (March 8, 2010) – selection, co‐evolution, sex (evolutionarily) ...
... Biology 1B – Evolution Lecture 6 (March 8, 2010) – selection, co‐evolution, sex (evolutionarily) ...
File
... heritable variation to improve crops and livestock They would only breed the large hogs, the fastest horses, etc. ...
... heritable variation to improve crops and livestock They would only breed the large hogs, the fastest horses, etc. ...
Adolescence
... ingressive males occasionally receive the dreaded sissy label On the other hand, some males get a big charge from bragging about sexual encounters But for women, looking sexy is desirable, but engaging in relations is a dilemma – lose the guy or be labeled easy ...
... ingressive males occasionally receive the dreaded sissy label On the other hand, some males get a big charge from bragging about sexual encounters But for women, looking sexy is desirable, but engaging in relations is a dilemma – lose the guy or be labeled easy ...
Chapter 2 the Development of Evolutionary Theory
... In each generation, more individuals are produced than can survive. Individuals that possess favorable traits are more likely to survive and produce offspring than those who do not. ...
... In each generation, more individuals are produced than can survive. Individuals that possess favorable traits are more likely to survive and produce offspring than those who do not. ...
Sexual Selection - The Grange School Blogs
... certain traits in the opposite sex. For example, if females prefer tall males, over time there would be an increase in the number of tall males in the population. So therefore the preferences of one sex determine the areas in which the opposite sex must compete. It may be plumage in peacocks and eco ...
... certain traits in the opposite sex. For example, if females prefer tall males, over time there would be an increase in the number of tall males in the population. So therefore the preferences of one sex determine the areas in which the opposite sex must compete. It may be plumage in peacocks and eco ...
file.
... mating calls of bull elks, breeding coloration in guppies – illustrate behavior that is attention-creating to predators as well as potential mates, and are thus extremely costly (Houde 1987, Petrie 1994). The male’s ability to survive even with the handicap should then be a reliable indicator of ro ...
... mating calls of bull elks, breeding coloration in guppies – illustrate behavior that is attention-creating to predators as well as potential mates, and are thus extremely costly (Houde 1987, Petrie 1994). The male’s ability to survive even with the handicap should then be a reliable indicator of ro ...
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.