X chromosome
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The X chromosome is one of the two sex chromosomes in many organisms, including mammals, and is found in both males and females. It is a part of the XY sex-determination system and XO sex-determinatio
Nucleus of a female amniotic fluid cell. Top: Both X-chromosome territories are detected by FISH. Shown is a single optical section made with a confocal microscope. Bottom: Same nucleus stained with DAPI and recorded with a CCD camera. The Barr body is indicated by the arrow, it identifies the inactive X (Xi).
XY sex-determination system
Videos
The XY sex-determination system is a sex-determination system present in many mammals, some insects, some snakes, some fish, and some plants.
X chromosome
…The X chromosome is one of the two sex chromosomes in many organisms, including mammals, and is found in both males and females. It is a part of the XY sex-determination system and XO sex-determination system. The X chromosome was named for its unique properties by early researchers, which resulted in the naming of its counterpart…
Pollen cones of a male Ginkgo biloba tree, a dioecious species
Ovules of a female Ginkgo biloba
PBB Protein SRY image
Nettie Stevens in 1904