XY sex-determination system
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The XY sex-determination system is a sex-determination system present in many mammals, some insects, some snakes, some fish, and some plants.
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
Sex chromosome
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Sex chromosomes are chromosomes that carry the genes that determine the sex of an individual. The human sex chromosomes are a typical pair of mammal allosomes. They differ from autosomes in form, size
XY sex-determination system
…some snakes, some fish (guppies), and some plants (Ginkgo tree). In this system, the karyotypic sex of an individual is usually determined by a pair of sex chromosomes. Typically, karyotypic females have two of the same kind of sex chromosome (XX), and are called the homogametic sex. Karyotypic males typically have…
Mice X Y chromosomes