CLIL CLIL CLIL BIOLOGY DARWIN S THEORY Read the information below and explain how natural and artificial selection differ. Charles Darwin used information from several disciplines in developing his theory of evolution and gathered1 data for 20 years before publishing The Origin of Species by Means of Natural Selection in 1859. He was impressed by the number of variations within living species, especially in domestic animals. Even in his day, there were breeding2 programs for artificial selection to determine certain characteristics in animals, especially dogs. However, since all dogs 1. gathered: brought together, belong to the same species, they share the same gene pool3, which collected 4 means they can interbreed and produce fertile offspring. Darwin 2. breeding: keeping animals came to the conclusion that geologically older species of life gave for reproductive purposes 3. gene pool: all the genes rise5 to geologically younger and different species through a process available within populations of natural selection. of a particular species 4. interbreed: put together animals of different species for reproductive purposes 5. give rise to: to cause something to happen Complete the sentences below to make definitions. a. b. Variation Competition c. d. e. Offspring Genetics Natural selection a. 38 b. 1. is when organisms are rivals. 2. is when organisms produce more offspring than can survive. 3. is when organisms pass their traits onto their offspring. 4. is when organisms with the most successful traits survive and reproduce. 5. is when there are differences in each population. c. d. e.