PPT-Sexual Selection - Recognized as a deviation from predictions offered by a strict

In this case there are different selective pressures on each SEX Sexual Selection Recognized as a deviation from predictions offered by a strict selection model 1 The Basics Sexual Selection . In fact we already did this when we were discussing the ABO blood group polymorphism Just to get some notation out of the way though lets de64257ne ij as the frequency of genotype and as the frequency of allele Then ij if if Unfortunately the simpl brPage 4br Mate Guarding Titi monkey male showing mate guarding by preventing female partner from visiting male neighbor brPage 5br Humans have malemale competition Topkapi Harem then and now brPage 6br Mean number of offspring for males and females Misleading signals of . crypsis. Warning signals of aposematism. S. ignals as isolating mechanisms. Sexual selection. Parental social selection. Membracid bizzare may be sensory crypsis. Neuron stereotypy and the omega neuron. Evolutionary Mechanisms. Genetic Drift . Migration. Mutations. Natural Selection. Non-adaptive. Adaptive. Natural. . . Selection. (1) Sexual Selection. (2) Constraints on Natural Selection. Pleiotropy. - Recognized as a deviation from predictions offered by a strict selection model. . In this case, there are different selective pressures on each SEX.. Sexual Selection . - Recognized as a deviation from predictions offered by a strict selection model.. 2014. Why learn about evolution in . Env. . Ed?. Extinction is important. -95-99% of species that have ever existed are now extinct. -this allows “an opening” for other creatures to develop . -the current mass extinction event is not natural which causes a concern for some. In Birds of Prey. By: Angel Gosnell. Reverse of the norm. In normal size dimorphism, males are typically larger than females due to intrasexual selective pressures. . In RSD, females are larger than males. . ,. and the rise of biological complexity. Selection needs variation. Most species have great variation in . reproductive success. .. This variation is the basis for natural selection. that means changes in gene frequencies. . Evolutionary Mechanisms. Genetic Drift . Migration. Mutations. Natural Selection. Non-adaptive. Adaptive. Natural. . . Selection. (1) Sexual Selection. (2) Constraints on Natural Selection. Pleiotropy. SEXUAL SELECTION. John Hunter . (1728-1793). John Hunter. -distinguished primary sexual characteristics (those present at birth) . from . secondary sexual characteristics (those that appear with sexual maturity). Solomon Chak. Virginia Scientists & Educators Alliance – VA SEA. 2016. I. Background. Top : . ChrisO. at . English . Wikipedia. Bottom: . Hagerty. . Ryan, U.S.FWS . , public domain. Top: Darwin . Intersexual and . Intrasexual. Selection. Evolutionary Models of Mate Choice. Learning and Mate Choice. Cultural Transmission and Mate Choice. Male-Male Competition and Mate Choice. I. n 1860, . Charles Darwin wrote in a letter to his friend Asa Gray that “…the sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick!” Darwin was worried that the peacock’s tail couldn’t possibly help in its survival, and thus could be construed as evidence against his grand theory of evolution by natural selection.. Intersexual and . Intrasexual. Selection. Evolutionary Models of Mate Choice. Learning and Mate Choice. Cultural Transmission and Mate Choice. Male-Male Competition and Mate Choice. I. n 1860, . Charles Darwin wrote in a letter to his friend Asa Gray that “…the sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick!” Darwin was worried that the peacock’s tail couldn’t possibly help in its survival, and thus could be construed as evidence against his grand theory of evolution by natural selection.. …and extinction. Major questions:. Why do males* compete for access to females?. Why are females* so choosy. ?. direct & indirect benefits. sexy sons, good . genes. *Except for sex-role reversed species.