Alfred Henry Sturtevant (November 21, 1891 - April 5, 1970) was an Americangeneticist, Sturtevant constructed the first genetic map of a chromosome in 1913. Throughout his career he worked on the organism Drosophila melanogaster with Thomas Hunt Morgan. November 21 is the 325th day of the year (326th in leap years) in the Gregorian Calendar. ... 1891 was a common year starting on Thursday (see link for calendar). ... April 5 is the 95th day of the year in the Gregorian calendar (96th in leap years). ... 1970 was a common year starting on Thursday. ... American, when used as an adjective, can mean of the United States of America or of or relating to the Americas; when used as a noun, United States citizen, residing in the Americas, or less frequently American English. Immigrants to the United States are usually called first-generation Americans, regardless... Genetics (from the Greek genno γεννώ= give birth) is the science of genes, heredity, and the variation of organisms. ... Figure 1: Chromosome. ... 1913 is a common year starting on Wednesday. ... Binomial name Drosophila melanogaster Drosophila melanogaster (Black-bellied Dew-lover) a dipteran (two-winged) insect, is the species of fruit fly that is commonly used in genetic experiments; it is among the most important model organisms. ... Thomas Hunt Morgan Thomas Hunt Morgan (September 25, 1866 - December 4, 1945) worked in natural history, zoology, and macromutation in the fruit fly Drosophila. ...
Sturtevant's discoveries of the principle of gene mapping, of the first reparable gene defect, of the principle underlying fate mapping, of the phenomena of unequal crossing-over, and of position effect were perhaps his greatest scientific achievements.
Sturtevant was as much concerned with the role of genes in development as with the laws governing their transmission from one generation to the next.
Sturtevant's discovery of this phenomenon of "position effect" was the first demonstration that primary genic interactions occur at the site of the genes in the chromosome, as opposed to elsewhere in the nucleus or cytoplasm.
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