In 1876, the present scientist Gangpadhat Aiwathar Riham was the first to observe the division of myocyte cells in the ovary. In 1883, Bonedeni and Hauser discovered the number of chromosomes in haploids in the worm genome. In 1887, the scientist Dobrangsdahah was the first to describe the reduction process in chromosomes. In 1887, Irawatu was the first to observe meiotic cell division in the roundworm genitalia. In 1888, the scientist Jhathdhangnanthmavat first observed the reductive division of chromosomes in the reproductive mother cell of a flowering plant. In 1905, Vajnyani Ridhatsavat and Gardtava named the first Myosci. In 1911, he was the first to prove crossover and genetic rearrangement in Drosophila.