10:26PM 4/9/07
abstract 16
Sex
Limited Inheritance In Drosophila
By: T H Morgan 1910
The result of this effort was to link a rare
white-''eyedness of certain male fruit flies that is from the
recessive haploid allele of males.
Dominant Eye Color is brilliant red for the species. Mr. Morgan called the later normal flies, but I call it the dominant red allele, or the dominant haploid allele. The only way you can get the recessive characteristic in the progeny is to have both parents'' giving recessive alleles in the diploid offspring. Also, there are no white-
eyed females. I think Mr. Morgan must be one of the fore fathers of Population Genetics. He ignores the few resultant white eyed ones in the first
generation of over a thousand fruit flies. But uses a red eyed female that could have either dominant-dominant red eyed diploid alleles or the female could have dominant-recessive red- eyed diploid alleles. Either one would yield the red eye. Further, He uses one of the first generation male that could have recessive-recessive white-eyed diploid. This pair of experimental theses white eyed males to start the next generation. This blending which between white and red parents produces over a thousand offspring white eyed ones in the first generation to focus on the next generation that results from the Fruit flies inbreeding gets a much larger percentage of white-eyed males, 20% -- Mr. Morgan thought the new character showed itself therefore to be sex limited in the sense that it was transmitted to the grandsons. So it must have been a point on the locus genes that translate into other qualities of fruit-fly maleness as well because the whiter eyes have to go along with the other maleness qualities. I think he should have had a wild or different groups'' female to do
experiment. I think the female was the Control of this experiment only he didn''t control it. Because his female had much higher probability to be a carrier of the recessive trait and still red eyed than perhaps another female of the same species from a wild or different stock would. He took his control from the same first generation that the original male came from where the female could be red eyed but still carry a recessive allele. If it''s sex limited then it can go either way. I think you’d get a better experiment with a more random female....
This is an important experiment because it is mirror into sex limited inheritance selection advantages to an organism or the opposite as a sex limited inheritance selection disadvantage to an organism such could be the case in selection metamorphosis as in hemophilia, and albinism. Rex S. "The Parvusvox Journal"
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