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Chromosomal Sex Determination in Drosophila - Developmental Biology - NCBI Bookshelf

Sexual Dimorphism. Sexual dimorphism is the systematic difference in form between individuals of different sex in the same species. For example, in some species, including many mammals, the male is larger than the female. In others, such as some spiders, the female is larger than the male.
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NCBI Bookshelf. Although both mammals and fruit flies produce XX females and XY males, their chromosomes achieve these ends using very different means. The sex-determining mechanisms in mammals and in insects such as Drosophila are very different. In mammals, the Y chromosome plays a pivotal role in determining the male sex.
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