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At Lexington, Kentucky, U.S.A
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At the age of ten, he showed an immense interest in natural history. He collected birds, birds' eggs, and fossils,
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He was educated at the University of Kentucky, where he took his B.S. degree in 1886, and doing postgraduate work at Johns Hopkins University, where he studied morphology and physiology.
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The year after his graduation, he spent some time at the seashore laboratory of Alphaeus Hyatt at Annisquam, Mass.
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He was engaged in research for the United States Fish Commission at Woods Hole
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Born in Melrose, MA
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He spent the summer at the Marine Biological Laboratory in Woods Hole, He also obtained his Ph.D. degree at Johns Hopkins University and in thr same year he was awarded the Adam Bruce Fellowship.
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He became Associate Professor of Biology at Bryn Mawr College for Women in 1891.
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He worked at the Marine Zoological Laboratory in Naples which he visited in 1895 and also in 1900. Where he met Hans Driesch and Curt Herbst. The influence of Driesch turned his mind in the direction of experimental embryology.
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He became Professor of Experimental Zoology at Columbia University, New York
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He challenged the assumption then current that the germ cells are pure and uncrossed and was sceptical that species arise by natural selection.
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He began the work on the fruitfly Drosophila melanogaster. He wrote papers that dealt with the demonstration of sex linkage of the gene for white eyes in the fly, the male fly being heterogametic. His work also showed that very large populations of Drosophila could be bred.
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He wrote a book on the linear arrangement of the genes in the chromosomes
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Professor of Genetics, University of Chicago (1926-55)
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He was appointed Professor of Biology and Director of the G. Kerckhoff Laboratories at the California Institute of Technology, at Pasadena.
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First decade of his career was spent at the Department of Agriculture where he perfected the inbreeding coefficient, a mathematical algorithm for determining the effect of inbreeding on heterozygosity
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On his notion of "shifting balance"
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He thought that many species were subdivided into small populations that exchanged a few migrants with each other but were not completely isolated.
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Population subdivision continued
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He was awarded the Nobel Prize for his discoveries concerning the role played by the chromosome in heredity
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Thomas H. Morgan died on December 4, 1945
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Leon J Cole Professor of Genetics, University of Wisconsin at Madison (1955-60)
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He is awarded the Darwin Medal (1966)
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National Medal of Science (1966)
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Throughout his career, Wright made many contributions to the study of the relationship between genotype and phenotype using guinea pigs. Wright showed the importance of considering the effects of combinations of genes rather than the effects of individual genes.
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Study of guinea pigs continued
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Phase 1: the exploratory phase, is characterized by the action of genetic drift
Phase 2: natural selection
Phase 3: those populations that are at higher fitness peaks send off migrants to the other populations -
Study of guinea pigs continued
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Died in Madison, WI
