PPT-Which of the following is NOT a way in which natural selection affects the distribution

A Directional selection Chance events Stabilizing selection Disruptive selection Answer Key LO 12 Directional selection is most common wen a populations environment changes or when members of a population migrate to a new habitat with different environmental conditions than their former one Stabilizing selection acts against extreme phenotypes and favors intermediates variants Disruptive selection occurs when environmental conditions favor individuals on both extremes of a phenotypic range over intermediate phenotypes An example of directional selection is that black bears in Europe increase with size during the colder weather only to decrease during the warmer weather An example of stabilizing selection is the birth weights of most human babies lie in the range of 34 kg babies who are much smaller or larger suffer higher rates of mortality An example of disruptive selections is black bellied seed cracker finches have two different beak sizes for cracking different types of seeds . Evolution. Believed to be 4.5 billion years old. Thought to have had a very anaerobic atmosphere. Earliest organisms were able to survive primitive environments. Prokaryotes that resemble today’s bacteria. Evolution: Teachable Tidbit. Context. : . Introductory biology for science majors . 2 full class periods and a follow-up exam question. Learning Goal. : We want students to understand that natural selection is a phenomenon that applies to their lives. G7- I can list examples of changes in genetic traits due to natural and manmade influences. What is Natural Selection?. Write it on your white board. Which of the following is an example of Natural Selection?. Relative fitness in relation to. Natural selection. Natural selection often has “survival of the fittest” and the “struggle to survive” associated with it, but it doesn’t necessarily mean direct physical conflict between two organisms.. What is natural selection?. It’s the . process whereby organisms better adapted to their environment tend to survive and produce more offspring. . The . theory. of its action was first fully . explained . Context. : . Introductory biology for science majors . 2 full class periods and a follow-up exam question. Learning Goal. : We want students to understand that natural selection is a phenomenon that applies to their lives. 3 Mechanisms for selection and an introduction to . Hardy-Weinberg. Lyell’s Influence. In attempt to . explain the past in terms of present day processes. , Darwin went to local farmers and animal breeders and observed…. Motivation. Most powerful mode of evolution. Explains observation of Descent with Modification. Nonrandom survivorship/reproduction of individuals based on particular features of their phenotype. . Any environmental agent may be the cause of natural selection. According to evolutionists. Characteristics of Organisms in the Galapagos Islands compared to nearby South America. Darwin hypothesized that animals came to the . Galapagos. from the . mainland. and they became . A. Species overproduce offspring that may survive an environment.. B. There is little variation among members of a population.. C. Competition for resources, mates, and space among species leads to a struggle to survive.. Spring Feb 2015 . Gene Frequency . Random . g. enetic mutations occurs. Inherent. Variation . Sexual reproduction. . Relationship between Gene Frequency and Natural . S. election. Natural Selection. For more information on how you can help our environment or to make some suggestions of your own please go to wwwcoolaustraliaorgrealised that the beaks were di31erent depending on local food source F Charles Robert Darwin. . (1809-1882) was an English naturalist who . born on 12th February, 1809. at Shrewsbury, England. . He went on . voyage. . (trip, expedition, tour). for five years (1831 to 1836) and . Science. Learning intention. To know what 'natural selection' is and how it works. . You will need. A pen and paper or your laptop to record your answers. . The internet . to access the weblinks on later slides.