In adaptive divergence, animals of the same or closely related group exhibit great divergence in their morphology when found in a different habitat. Adaptive radiation is of two types: adaptive divergence and adaptive convergence. Adaptive Radiation (Macroevolution): The evolution, which results in the production of new adaptive types through a process of population fragmentation and genetic divergence, is known as adaptive radiation or macroevolution. Figure 33.10 shows adaptive radiation in mammals. General guide on these review questions here. Adaptive radiation is one of the most important out-comes of the process of evolution, and islands are places where it is best observed. By adapting to forest, plains, air, water, and underground, mammals have Notes for Understanding Evolution - Chapter 13. 3.2.1 Adaptive radiation. An adaptive radiation generally means an event in which a lineage rapidly diversifies, with the newly formed lineages evolving different adaptations. Adaptive radiation. Examples of adaptive radiation in Class-Mammalia 9. Placental Mammals in Australia: Placental mammals in Australia also exhibit adaptive radiation in evolving into varieties of such placental mammals each of which appears to be ‘similar’ to a corresponding marsupial. Different factors may trigger adaptive radiations, but each is a response to an opportunity. Definition. Adaptive radiation, evolution of an animal or plant group into a wide variety of types adapted to specialized modes of life. CBSE Ncert Notes for Class 12 Biology Evolution. The new world has the common opossum, also a unique form. To Study Adaptive Radiation : Marsupials & Placental Mammals - Evolution, Biology, Class 12 Class 12 Video | EduRev for Class 12 this is your one stop solution. The term itself was fi rst used by H. F. Osborn in in describing parallel adapta-tions and convergence of species groups on different land masses. Adaptive Radiation explained with examples . ADAPTIVE RADIATION Definition The term adaptive radiation has been coined by H.F. Osborn (1902) for explaining evolution, from a single ancestor,of a number of descendants with a great variety of adaptations to different niches. 3. Characteristics 6. Adaptive radiation is a rapid increase in the number of species with a common ancestor, characterized by great ecological and morphological diversity. A. Adaptive radiation in mammals 1. Causes 4. Under Construction. Radiation in Limb Structure of Mammals: Mammalian limbs are the modifications of the pentadactyl limb. Click link to return to Biology 409 Schedule or back to Chapter 12 or ahead to Chapter 14. 3. Mechanism 7. Since then, adaptive radiation … The evolution of different species in a given geographical area starting from its original character and radiating to other geographical area is called adaptive radiation. Click link to return to Biology 409 Schedule or back to Chapter 12 or ahead to Chapter 14. General guide on these review questions here. Learn exactly what happened in this chapter, scene, or section of Speciation and what it means. Adaptive radiations of multiple species from a single ancestral lineage are best exemplified in closely related groups that have evolved in a relatively short time. CONTENTS 1. Notes on Adaptive Radiation, Macroevolution and its Essential Features!