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GEOGRAPHICAL ISOLATION
... migration of fertile individuals or gametes between populations (reduces differences between populations) ...
... migration of fertile individuals or gametes between populations (reduces differences between populations) ...
artificial selection
... AS has been used to test models of sexual selection and mate choice. In Kanchon's lecture on sexual selection, he discussed female choice, in which males compete for the favours of females. The problem is how to explain the evolution of characters such as male ornamental traits (e.g. the peacock's t ...
... AS has been used to test models of sexual selection and mate choice. In Kanchon's lecture on sexual selection, he discussed female choice, in which males compete for the favours of females. The problem is how to explain the evolution of characters such as male ornamental traits (e.g. the peacock's t ...
Evolution KEY
... Lyell: gradualism (earth is sculpted by gradual geological process) Lamarck: hypothesis of evolution (adaptations can allow an individual success based on its environment and are passed on) 3. What were the 3 important observations that Darwin made during his voyage? 1. Organisms had characteristics ...
... Lyell: gradualism (earth is sculpted by gradual geological process) Lamarck: hypothesis of evolution (adaptations can allow an individual success based on its environment and are passed on) 3. What were the 3 important observations that Darwin made during his voyage? 1. Organisms had characteristics ...
Evolution - Donald Winslow
... Competition and heritable variation Differential survival & reproduction Gradual adaptation & speciation ...
... Competition and heritable variation Differential survival & reproduction Gradual adaptation & speciation ...
Evolution Part 2
... generation inside their bodies and also literally provide food for the babies out of their own body – Female goal: mate with a successful and healthy male – Additional goal: mate with a male who will actually ...
... generation inside their bodies and also literally provide food for the babies out of their own body – Female goal: mate with a successful and healthy male – Additional goal: mate with a male who will actually ...
Natural Selection Study Guide
... c. Created the theory of “Natural Selection” d. Islands that Darwin visited and helped him to create his theory for evolution e. Selection that humans do to create different types of animals and plants f. Differences among members of a group of species g. variations that are helpful to the organism ...
... c. Created the theory of “Natural Selection” d. Islands that Darwin visited and helped him to create his theory for evolution e. Selection that humans do to create different types of animals and plants f. Differences among members of a group of species g. variations that are helpful to the organism ...
5.2 Natural selection
... The diversity of life has evolved and continues to evolve by natural selection. ...
... The diversity of life has evolved and continues to evolve by natural selection. ...
Natural Selection Worksheet
... 1. At the start of the industrial revolution, _____________ of the peppered moths in London were black. 2. By __________, ____________ of the peppered moths in London were black. 3. Natural selection is the process by which certain _______________________________ make it easier 4. for some individua ...
... 1. At the start of the industrial revolution, _____________ of the peppered moths in London were black. 2. By __________, ____________ of the peppered moths in London were black. 3. Natural selection is the process by which certain _______________________________ make it easier 4. for some individua ...
Supporting Online Material for
... the heritability of sexually selected characters is high (about 0.6) (10) implying indifference to rank-ordered genetic quality. Instead, females choose genetic complementarity—best match not best male, or phenotypic state (health) (11). “Resolving” lek-paradox impossible. (12) 11. Sexual selection ...
... the heritability of sexually selected characters is high (about 0.6) (10) implying indifference to rank-ordered genetic quality. Instead, females choose genetic complementarity—best match not best male, or phenotypic state (health) (11). “Resolving” lek-paradox impossible. (12) 11. Sexual selection ...
Evolutionary Theory Nature and Nurture The 3 Premises of Natural
... Natural selection favours traits that help organisms to increase their genetic representation in future generations. Traits increasing reproduction will be favoured over traits increasing survival if the two are in conflict. Survival is only useful to an organism inasmuch as it is correlated with in ...
... Natural selection favours traits that help organisms to increase their genetic representation in future generations. Traits increasing reproduction will be favoured over traits increasing survival if the two are in conflict. Survival is only useful to an organism inasmuch as it is correlated with in ...
Ch 15.3 m definitions
... Gradualism – formation of a species through slow and steady change in a species. Hardy-Weinberg Principle – states that change in a population won’t happen if five conditions can be met. Postzygotic isolating mechanism – a type of reproductive isolation that occurs after fertilization. ...
... Gradualism – formation of a species through slow and steady change in a species. Hardy-Weinberg Principle – states that change in a population won’t happen if five conditions can be met. Postzygotic isolating mechanism – a type of reproductive isolation that occurs after fertilization. ...
Supplementary Material Chapter 4 Word Document
... parthenogenesis (‘virgin birth’), and although it is not found among mammals and birds, it is not uncommon in fish, lizards, frogs and plants. Males are a problem because, in the absence of male care (which is very common), a mutation that made a sexually reproducing organism switch to parthenogenes ...
... parthenogenesis (‘virgin birth’), and although it is not found among mammals and birds, it is not uncommon in fish, lizards, frogs and plants. Males are a problem because, in the absence of male care (which is very common), a mutation that made a sexually reproducing organism switch to parthenogenes ...
Behavioral Evolution and Sexual Selection Why does mate choice
... linked on a chromosome, but they will behave as if they are linked since they will be inherited together. Spotted cucumber beetle, Diabrotica undecimpunctata ...
... linked on a chromosome, but they will behave as if they are linked since they will be inherited together. Spotted cucumber beetle, Diabrotica undecimpunctata ...
Evolutionary Psychology
... advantageous traits will survive in their environment longest and so have most mating potential. ...
... advantageous traits will survive in their environment longest and so have most mating potential. ...
Natural Selection
... How Natural Selection Works All populations have genetic diversity (they are not 100% identical) If an individual is born/produced that has trait which make it more fit it then is more likely to survive and reproduce When it reproduces there is a higher chance that the beneficial traits will ...
... How Natural Selection Works All populations have genetic diversity (they are not 100% identical) If an individual is born/produced that has trait which make it more fit it then is more likely to survive and reproduce When it reproduces there is a higher chance that the beneficial traits will ...
DARWINIAN EVOLUTION e13 Sexual selection differential
... peacock? Artificial selection can produce features that a dispassionate appraiser would see as clearly disadvantageous to an individual’s survival in the wild. Natural selection, in the best of all worlds, should refine a species. What can be said of the tail of a peacock is that only male peacocks ...
... peacock? Artificial selection can produce features that a dispassionate appraiser would see as clearly disadvantageous to an individual’s survival in the wild. Natural selection, in the best of all worlds, should refine a species. What can be said of the tail of a peacock is that only male peacocks ...
Charles Darwin and Natural Selection
... • Homeobox genes indicate a very distant common ancestor. – control the development of specific structures – found in many organisms ...
... • Homeobox genes indicate a very distant common ancestor. – control the development of specific structures – found in many organisms ...
Section 16-2
... 1. Any violation of the conditions necessary for Hardy-Weinberg equilibrium can result in a. independent assortment. b. disorganizing selection. ...
... 1. Any violation of the conditions necessary for Hardy-Weinberg equilibrium can result in a. independent assortment. b. disorganizing selection. ...
Sexual Selection
... • Females produce large, energetically expensive eggs and often provide parental care • Females increase reproductive success by increasing the quality of their mates Choosy females • Female choice can dictate rules of male competition and shape male behavior • Selects for traits in males that appea ...
... • Females produce large, energetically expensive eggs and often provide parental care • Females increase reproductive success by increasing the quality of their mates Choosy females • Female choice can dictate rules of male competition and shape male behavior • Selects for traits in males that appea ...
2013_Cryan_Sexual_Selection copy
... characters such as color patterns, ornaments, vocalizations, or display behaviors Sexual characters & courtship displays originally thought of as species-specific signals designed to encourage females to mate Darwin hypothesized that displays were used to advertise male quality, and that females a ...
... characters such as color patterns, ornaments, vocalizations, or display behaviors Sexual characters & courtship displays originally thought of as species-specific signals designed to encourage females to mate Darwin hypothesized that displays were used to advertise male quality, and that females a ...
Darwin proposed natural selection as the mechanism of evolution
... – Closely resemble a species near S. American’s mainland ...
... – Closely resemble a species near S. American’s mainland ...
Natural Selection
... pressure so that traits which are better adapted in a particular environment enable the organisms within a population to survive to reproductive age. The ability to reproduce is called fitness. Alfred Wallace coined the term “survival of the fittest”. ...
... pressure so that traits which are better adapted in a particular environment enable the organisms within a population to survive to reproductive age. The ability to reproduce is called fitness. Alfred Wallace coined the term “survival of the fittest”. ...
06_prughNS2
... that males are high-quality Ornaments expensive to produce, only males in good condition can have them Ornamental males less likely to have disease ...
... that males are high-quality Ornaments expensive to produce, only males in good condition can have them Ornamental males less likely to have disease ...
SUMMARY OF FINAL QUESTIONS Assessment questions Jen T
... sperm while the female and large male are mating. (3) Resulting effect on fitness - The trait for large and small male body size are passed on to the offspring. Medium-sized males may have a disadvantage because they are not able to mate with a female and are not small enough to sneak up on a mating ...
... sperm while the female and large male are mating. (3) Resulting effect on fitness - The trait for large and small male body size are passed on to the offspring. Medium-sized males may have a disadvantage because they are not able to mate with a female and are not small enough to sneak up on a mating ...
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.