e/White (mutation)

Information
has gloss	eng: white was the first sex-linked mutation ever discovered in Drosophila melanogaster. In 1910 Thomas Hunt Morgan, (or, legend has it, his wife) collected a single male white-eyed mutant from a population of Drosophila melanogaster fruit flies, which usually have bright red eyes. Upon breeding this male with wild-type female flies he found that the offspring did not conform to the expectations of Mendelian inheritance. The first generation (the F1) produced 1,237 red-eyed offspring and three white-eyed flies, all males. The second generation (the F2) produced 2,459 red-eyed females, 1,011 red-eyed males, and 782 white-eyed males. Further experimental crosses led Morgan to the conclusion that this mutation was somehow physically connected to the "factor" that determined gender in Drosophila. Morgan named thi s trait white, now abbreviated w. Flies carrying the white allele are frequently used to introduce high school and college students to genetics.
lexicalization	eng: white
instance of	(noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors" factor, gene, cistron

Media
media:img	White-eyed Drosophila.jpg