Salim Ali

Born-12 November 1896 AD and died-20 July 1987 AD. He was an Indian citizen. He is the best ornithologist and naturalist of South Asia. He emphasized on the recording, distribution and conservation of bird species of the Indian subcontinent. His books are – The Book of Indian Birds, Indian Hill Birds, Our Birds etc. Awards received Padma Vibhushan, Padma Bhushan etc.

Alexander Fleming

Born-6 August 1881 AD and died-11 March 1955 AD. He is an English biologist and pharmacologist. He discovered the enzyme called lysozyme in 1923. In 1928 Penicillin was discovered from Penicillium notatum. Did extensive research on bacteriology, immunology and chemotherapy. Awarded Nobel in Medicine, John Scott Legacy Medal and Premium, Albert Medal etc.

Thomas Hunt Morgan

Born-5 September 1866 AD and died-4 December 1945 AD. He was a citizen of the United States. He is an American geneticist, evolutionary scientist, and embryologist. He proved that chromosomes are inside the cell nucleus and genes are located in chromosomes. Genes are arranged in sequence and are transmitted as hereditary traits. Describe the mechanism of transmission of hereditary characteristics. Chromosomal theory explains the linear arrangement of genes on chromosomes, crossing over and mutation. His books are – The Mechanism of Mendelism Heredity, The Theory of Gene, Heredity and Sex etc. Awarded Nobel (1933), Member of the National Academy of Sciences (1909).