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Unformatted text preview: Evolution in the News Tu Oct 9 Speciation Macroevolution and Where All Those Species Came From. Chapter 9 WEBCT-Chapter 19 Volpe and Rausenbaum Visit : Tree of Life Web Project Assignment 2 assigned WEBCT-Chapter 19 Volpe and Rausenbaum Read: "Evolution Occurs faster at the equator." Th Oct 11 Punctuated Equilibrium Tree of Life Tu Oct 16 Molecular Evolution DEVO EVO Read: WEBCT Chapter 15 Volpe From a few genes life's myriad shapes. Read: The Origin of Animal Body Plans. Th Oct 18 Tu Oct 23 Fall Break Emergence of the Human Species Visiting lecturer: Lisa M. Paciulli Chapter 14 & 15 Th Oct 25 Tu Oct 30 GRADED CLICKER QUIZ EXAM 2 REVIEW Exam 2 Assignment 2 Due Which of the following is NOT a component of today's biological concept of a species? A. a population of organisms whose appearance is sufficiently similar B. a population or group of populations that interbreed under natural conditions C. reproductive isolation from other populations D. the production of viable and fertile offspring SPECIES A group of organisms capable of interbreeding and producing fertile offspring. Panthera tigris Panthera leo LINK Lions and tigers are two different species. They look different, they have different lifestyles, they vocalize differently, and they generally live on different continents. Yet when they are brought together artificially, they can interbreed. Such hybrids are called tigons and ligers. The liger is a hybrid cross between a male lion and a female tiger. A liger resembles a lion with diffused stripes. They are the largest cats in the world, although the Siberian Tiger is the largest pure sub-species. Like tigers, but unlike lions, ligers enjoy swimming. A similar hybrid, the offspring of a male tiger and a female lion is called a tigon. While male ligers are sterile, female ligers are fertile, and they can reproduce. Because only female ligers and tigons are fertile, a liger cannot reproduce with a tigon. Father Lion Tiger Lion Lion Tiger Mother Tiger Lion Liger Tigon Liger Results Liger Tigon Li-liger Li-tigon Ti-liger Tiger Tigon Ti-tigon Do tigons and ligers challenge the definition of species? Clicker questio...
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- Fall '08