Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 7. Heredity & Evolution
Specification
Specification It is the formation of new species from an existing one due to reproductive isolation of a section of its population. Development of reproductive isolation is basic to formation of new species. This can occur by the following methods Physical Barrier : A physical barrier like valley, mountain, water body, etc. develop between two populations of a species. Two Ends of Long Range : Subpopulations at the two ends of a long range seldom interbreed. Mutations : A large mutation can make some members reproductively isolated from the rest. Genetic Drift (Wright Effect) : It is random change in gene frequency that occurs in a small population due to fixation of certain alleles and elimination of others.