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Notes Unit 4 Part 8
Notes Unit 4 Part 8

... Mutation = a change in an organism’s ________  mutations are ____________ and can have unpredictable effects  errors in DNA provide the ______________ that is fundamental to the evolution of a species  most mutations result in ___________ or the lack of normal development in an organism  if the ...
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BioA414 Handout VII-2017

... • Infinite alleles model predicts that mutation and dri ft balance each other to result in a steady state of heterozygosity – Each mutation is assume d to gene rate a novel allele ne ve r obse rve d – Genetic drift ope rates as normal – Hete rozygosity  H = (4 Ne )/ (1 + 4 Ne  ) – Neutral paramet ...
Chapter 13 - Angelfire
Chapter 13 - Angelfire

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LN #23

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Green Chapter 17 Test Review

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Darwinism - my social studies class

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... 1. species – 2. variation – 3. adaptation – 4. fossils – 5. Darwin and His Theory 6. Evolution – 7. Lamarck vrs Darwin 8. HMS Beagle & The Galapagos Islands 9. Four main points of Darwin’s theory of Natural selection are? 10. Gradualism 11. Tracking changes (evidence of evolution) 12. homologous str ...
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... environment to survive and to reproduce. For example, giraffes born with longer necks are better able to reach food, resulting in long neck giraffes being healthier and living longer so that they can produce more offspring than short neck giraffes. The end result is the passing of the “long neck gen ...
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... • New genes usually evolve through duplication and divergence • Ortologous genes = duplicated as an accompaniment to speciation, retain the same function • Paralogous genes = duplicated in the genome of the same species, acquire new or more specialized function • Pseudogenes = duplicated genes that ...
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Organismal Biology/24A

... 3. The biological species concept has some major limitations • While the biological species concept has had important impacts on evolutionary theory, it is limited when applied to species in nature. • For example, one cannot test the reproductive isolation of morphologically-similar fossils, which ...
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Evolution study guide answer key

... As long as an animal can survive long enough to reproduce than they are considered fit. Meaning an organism might not be the strongest; it could have an adaptation that makes it sneakier and steal mates of other stronger animals. Example: crickets sometimes intercept female crickets on their way to ...
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Koinophilia



Koinophilia is an evolutionary hypothesis concerning sexual selection which proposes that animals seeking mate preferentially choose individuals with a minimum of unusual features. Koinophilia intends to explain the clustering of organisms into species and other issues described by Darwin's Dilemma. The term derives from the Greek, koinos, ""the usual"", and philos, ""fondness"".Natural selection causes beneficial inherited features to become more common and eventually replace their disadvantageous counterparts. A sexually-reproducing animal would be expected to avoid individuals with unusual features, and to prefer to mate with individuals displaying a predominance of common or average features. This means that mates displaying mutant features are also avoided. This is advantageous because most mutations that manifest themselves as changes in appearance, functionality or behavior, are disadvantageous. Because it is impossible to judge whether a new mutation is beneficial or not, koinophilic animals avoid them all, at the cost of avoiding the occasional beneficial mutation. Thus, koinophilia, although not infallible in its ability to distinguish fit from unfit mates, is a good strategy when choosing a mate. A koinophilic choice ensures that offspring are likely to inherit features that have been successful in the past.Koinophilia differs from assortative mating, where ""like prefers like"". If like preferred like, leucistic animals (such as white peacocks) would be sexually attracted to one another, and a leucistic subspecies would come into being. Koinophilia predicts that this is unlikely because leucistic animals are attracted to the average in the same way as other animals. Since non-leucistic animals are not attracted by leucism, few leucistic individuals find mates, and leucistic lineages will rarely form.Koinophilia provides simple explanations for the rarity of speciation (in particular Darwin's Dilemma), evolutionary stasis, punctuated equilibria, and the evolution of cooperation. Koinophilia might also contribute to the maintenance of sexual reproduction, preventing its reversion to the much simpler and inherently more advantageous asexual form of reproduction.The koinophilia hypothesis is supported by research into the physical attractiveness of human faces by Judith Langlois and her co-workers. They found that the average of two human faces was more attractive than either of the faces from which that average was derived. The more faces (of the same gender and age) that were used in the averaging process the more attractive and appealing the average face became. This work into averageness supports koinophilia as an explanation of what constitutes a beautiful face, and how the individuality of a face is recognized.
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