PPT-Collège Lionel-Groulx De la sélection sexuelle à la spéciation

Chapitres 23 et 24 Plan du cours La sélection sexuelle Organismes parfaits La spéciation un bref aperçu Collège LionelGroulx Lévolution des caractères sexuels secondaires la sélection sexuelle. Speciation—Drift. Drift is important in evolution. Just because an allele is common doesn’t mean selection favored it. Speciation via drift?. Probably not.. Flies in . allopatry. , same environment never . Patterns of Evolution. Credits: 4. External. ! Before we begin…. From the . examination specifications…. Giraffe Evolution?. Revision. 12 bio stuff…. Stuff u should know from Year 12. Natural Selection. 8.7. Starter. What is speciation?. The evolution of new species from existing species.. Learning Objectives. Define speciation. Describe geographical isolation. Explain how geographical isolation can lead to the formation of new species. Fondation Lionel-Groulx \r\n\r\n\n Table des mati EVOLUTION #1 (Group 3). Strawberry Frogs Forever. Participants: Lin Xiang. Ingo . Schlupp. Tiffany Roberts. Anne . Grippo. Jerry Farris. Facilitators: Brooke . Species & Speciation. Speciation. Gradual process in which one population separates from another.. AND builds up enough genetic differences to become a new species.. CONTENT SUMMRY:. Species & Speciation.. I. Species Definitions. Species represent the boundary for the spread of alleles . and define the unit in which the modes of evolution operate. Biological Species Concept. Individuals belong to the same species if they can interbreed with each other. Brian O. ’. Meara. EEB464 Fall . 2015. http://www.youtube.com/watch?v=lopTMhAbXoI. Initiation of speciation. Maintenance of current species. Prezygotic. Postzygotic. Zygote image © Laboratoire de Biologie de la Reproduction; Lausanne, image downloaded from . Partie . 1. :. Azote – . Phosphore . Collège Lionel-Groulx. 1. Plan du cours. Cycles biogéochimiques: généralités. Le cycle de l’azote et les zones mortes océaniques. Le cycle du phosphore et l’eutrophisation. V. ous avez vu toutes les étapes entre la digestion de l’amidon et le mouvement musculaire, . mais d’où vient l’amidon. ?. La pêche aux photons. Photosynthèse et adaptations au manque de lumière. Concept 22.2: Speciation can take place with or without geographic separation. Speciation can occur in two ways. Allopatric speciation. Sympatric speciation. Allopatric (. “. Other Country. ”. ) Speciation. Meara. EEB464 Fall . 2017. http://www.youtube.com/watch?v=lopTMhAbXoI. Learning objectives. Understand factors that can lead to speciation. Consider the geography of speciation. Describe approaches to . Gene Pool. All the alleles present in the reproducing members of a population at a given time.. The gene pool is constantly changing. Mutations add new alleles to the population. Immigration also adds new alleles; changes the allele frequency. I. Species Definitions. Species represent the boundary for the spread of alleles . and define the unit in which the modes of evolution operate. Biological Species Concept. Individuals belong to the same species if they can interbreed with each other.