History of Genetics: 3 Periods
The developmental history of genetics may be classified into three periods:- 1. Pre-Mendelian Era 2. Mendelian Era 3. Recent or Post Mendelian Era. 1. Pre-Mendelian Era: (A) Sexuality in Plants and Animals: This was mostly based upon theoretical concepts before 17th century. According to Harvey (1657), the animals are formed by eggs and sperm merely participate as vitalizing force, de [...]