![]() ![]() The study of the evolution of life forms on Earth is known as evolutionary biology. PDF Summary - Class 12 Biology Evolution Notes (Chapter 7) Though these forelimbs perform different functions in these animals, they have similar anatomical features. ![]() Bat, horse, and human (all mammals) share similarities In the pattern of bones of forelimbs. Write about the ancestry and evolution of bats, horses and humans on the basis of a comparative study of their forelimbs. As they passed on this acquired character of elongated neck to succeeding generations, Giraffes, slowly, over the years, came to acquire long necks.ġ0. He gave the examples of Giraffes who in an attempt to forage leaves on tall trees had to adapt by elongation of their necks. Before Darwin, a French naturalist Lamarck had said that evolution of life forms had occurred but was driven by the use and disuse of organs. Analogous organs show convergent evolution.Įxamples: Australian Marsupials and Placental mammalsĪns. Homologous organs show divergent evolution.Įxamples: Darwin's Finches Convergent Evolution - The development of similar adaptive functional structures in unrelated groups of organisms is called convergent evolution. Divergent Evolution - The development of different functional structures from a common ancestral form is called divergent evolution. Distinguish between convergent and divergent evolution giving one example of each.Īns. Natural selection is a process of selection by nature in which individuals with those characteristics which enable them to survive better in natural conditions would outnumber the others who are less adapted under the same natural conditions e.g. What is natural selection? Give one example also.Īns.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |