Genetics Genetics is the study of heredity and variations. Heredity and variations are controlled by genes—what they are, what they do, and how they work. Genes inside the nucleus of a cell are strung together in such a way that the sequence carries information: that information determines how living organisms inherit various features (phenotypic traits). \ For example, offspring produced by sexual reproduction usually look similar to each of their parents because they have inherited some of each of their parents' genes. Genetics identifies which features are inherited, and explains how these features pass from generation to generation. In addition to inheritance, genetics studies how genes are turned on and off to control what substances are made in a cell—gene expression; and how a cell divides—mitosis or meiosis. Some phenotypic traits can be seen, such as eye color while others can only b
Zoology .Zoology ( / z u ˈ ɒ l ə dʒ i , z oʊ -/ ) or animal biology is the branch of biology that studies the animal kingdom, including the structure , embryology , evolution , classification , habits , and distribution of all animals , both living and extinct , and how they interact with their ecosystems. .The term is derived from Ancient Greek ζῷον, zōion , i.e. " animal " and λόγος, logos , i.e. "knowledge, study". .History of Zoology:- Ancient history to Darwin The history of zoology traces the study of the animal kingdom from ancient to modern times. Although the concept of zoology as a single coherent field arose much later, the zoological sciences emerged from natural history reaching back to the biological works of Aristotle and Galen in the ancient Greco-Roman world. This ancient work was further developed in the Middle Ages by Muslim physicians and