This book is a compilation of various researches conducted by experts which focus on the genetic variation in animals. It discusses the scale of genetic variation present in animals. The genetic diversity exhibited by molecular markers gets extensive interest because of the utility of this information in breeding and conservation programs. In this theory, molecular markers give important data. The increasing availability of highly sophisticated molecular markers produces a detailed analysis and evaluation of genetic diversity in animals, and recognition of genes influencing reasonably significant qualities. The objective of the book is to offer a glance into the dynamic procedure of genetic variation in animals by presenting the opinion of experts who are engaged in the generation of new initiatives and techniques employed for the assessment of genetic diversity. The book should prove helpful for students and experts in the field of genetic protection.