PPT-Speciation Biological species definition:

groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups Mayr 1942 Beefalo Zebroid Zorse Ligers and Tigons oh my. speciation. Miss Amy Heeraman Form 5 Biology Friday 30. th. January 2015. VIDEO . . INTRODUCTION. Look at the video.. https://www.youtube.com/watch?v=Q2vsG77PZ80. – video 1 on speciation. VIDEO DISCUSSION. What is a Species?. Speciation. – the origin of new species. The . biological species concept. defines a species as a population or group of populations whose members have the potential to interbreed with one another in nature to produce viable, fertile offspring, but who cannot produce viable, fertile offspring with members of other species. The rise and fall of biodiversity. Four major . mass extinctions . of marine organisms:. End of Silurian Devonian, Permian, and Cretaceous). Rise in diversity during Cambrian, Silurian, Cretaceous, and Paleogene. 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. Species. == “kind” or “type” in Latin. Typological . (morphological) species. . == a group of organisms that share certain characteristics which are different than other groups—usually differences in anatomy. . Species. – group of organisms that interbreed and produce fertile offspring. Subspecies. – groups that are on the way to being separate species; have started being genetically different. Individuals in the same species share a common gene pool. Finish vocabulary cards from yesterday. VOCABULARY QUIZ NEXT MONDAY!. TEST NEXT THURSDAY! -4 MORE DAYS!. Types of Speciation, Evolution & Isolation. Thursday. January 22nd . Currently there are . Sympatric Speciation. Sympatric Speciation occurs . without. geographic isolation, thus it occurs at a local level. . There is something within the environment that keeps a single species separated into two or more distinct groups.. Learning Goal: . To explore the factors leading to the evolution of a new species. . Success Criteria:. I know I am succeeding when I can… . define the concept of speciation. identify the modes of speciation. Reduction in . gene . flow, genetic and phenotypic change in populations. The study of speciation requires that species be real. Speciation. Speciation is the antidote to sex. Keeps together adaptive groups of traits. Populations must become isolated. Reproductive isolation is key!. Once isolated, populations will evolve independently (different factors affecting each). Two types of speciation. allopatric. geographic separation. (Unit 10, species concept. Sympatric speciation . Sympatric speciation, (from the Greek ‘same place’) involves the splitting of an ancestral species into two or more reproductively isolated groups without geographical isolation of those groups.. Science. Lesson 8: challenge answer. Investigate and make note of other species that have evolved due to parapatric speciation. . Typically seen in species of fish.. Learning intention. To know what sympatric speciation is and how it occurs. . After reading this module you should be able to. Explain . the processes of allopatric and sympatric speciation.. U. nderstand . the factors that affect the pace of . evolution.. Speciation can be allopatric or sympatric.