Payton Miller November 2, 2015 Science Seminar 2020 Topic #3 The Driving Force of Sexual Selection on Speciation Speciation is a force that splits a species into more than one species because of one sex’s change in preference of mates that leads to divergence. According to Darwin in the Descent of Man, sexual selection “depends on the advantage which certain individuals have over others of the same sex and species solely in respect to reproduction.” Sexual selection is the selection of traits
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spread across many super-families of Hymenoptera (Gauld, Bolton, 1988). The large number of species and the amount of diversity we see is incredible. Speciation is without a doubt present, however the type and exact processes involved with this groups’ diversity has only been speculated. The following essay discusses the various possibilities for speciation in this group and how the particular behavior of this group has played
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the Astatilapia burtoni species, multiple mating behavioural experiments were documented with some surprising results. In comparison to many other literatures that suggest the number of egg spots on the anal fin effects adaptive mate choice and speciation by sexual selection, these studies found very little correlation. The mating preference trials seem to suggest female choice is based more commonly on mate size. Egg spot number is a correlated trait to size which plays a more significant role in
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causing chromosomal breakage, exon shuffling, sequence expansion, gene duplication, ectopic recombination, novel gene formation and expansion and re-wiring of genetic regulatory networks”, which can ultimately result in “rapid morphological change and speciation (Zeh et al., 2009, p. 715). This sort of mechanism becomes unleashed when there is significant stress to an organism, such as major climate change, and therefore responds rapidly (Zeh et al., 2009, 715). Zeh et al. (2009) further point out that
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*Q: What is Evolution? - Descent from modification * Macro Evolution (Large Scale Evolution) * Common Ancestor - descent of different species over many generations * OVER LARGER TIMESCALE (ex. Speciation) * Micro Evolution (Small Scale Evolution) * Changes in gene (allele) frequency in population from one generation to the next * May be over shorter time period (generations) * BOTH OF THESE IMPLY: * 1. Common Ancestry * 2. Changes through
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Assignment: SCIE211 Phase 2 Lab Report Title: Speciation Instructions: You will need to write a 1-page lab report using the scientific method to answer the following question: • What would happen if a species within a population were suddenly split into 2 groups by an earthquake that creates a physical barrier like a canyon? When your lab report is complete, post it in Submitted Assignment files. Part I: Use the animated time progression of speciation to help you write up your lab report. Part
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Hybrid zones have drawn great interest because they provide opportunities for further studies of the processes involved in divergence and recombination of species. Hybrid zones can be classified as primary or secondary, depending on their origins. In this study, we considered the hybrid zone within the Northern Flickers, which has been stable on the United States’ Great Plains throughout time. The interaction between the Red- and Yellow-shafted subspecies of Northern Flickers provides a great opportunity
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Session 1.3: The Evolution of Cellular Life Exam review view in a separate window In this session we focus on the natural history of cells and the evolutionary timelines of their appearance. The modern phylogenetic classification of domains is used to categorize the different types of cells: bacteria, archea, and eukarya. The names of periods and organisms and certain dates are often helpful in remembering or understanding events that occur in the natural history of evolution. However,
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Eldredge in 1972, is a model of species evolution to counter the explanation of evolutionary change through phyletic gradualism, or the slow accumulation of novel adaptations over evolutionary time, culminating in the appearance of new species (speciation). Gould and Eldredge argue that evidence of gradualism would require fossil evidence of intermediary stages in a species’ evolution, with different specimen of an evolving species exhibiting ancestral traits and an increasing number of derived
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The Fossil Record and Theories of Evolution. Introduction In general, the term 'evolution' can imply a drastic orgradual change from a very broad perspective. Life on earth, the universe,galaxies, as also the earth in general have evolved through millions of years.In this essay we consider only one aspect of evolution emphasizing on evolutionas a biological tool for change among species and consider fossil record assupportive of both evolution theories and also the other theories contrary toevolution
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