y-chromosome wikipedia - EAS
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The Y chromosome is one of two sex chromosomes (allosomes) in therian mammals, including humans, and many other animals. The other is the X chromosome. Y is normally the sex-determining chromosome in many species, since it is the presence or absence of Y that determines
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See moreDiscovery
The Y chromosome was identified as a sex-determining chromosome by Nettie Stevens at Bryn Mawr College in 1905 during a study of the mealworm Tenebrio molitor....
See moreBefore Y chromosome
Many ectothermic vertebrates have no sex chromosomes. If they have different sexes, sex is determined environmentally rather than genetically. For some of them, especially reptiles, sex depends on the incubation temperature....
See moreMany groups of organisms in addition to therian mammals have Y chromosomes, but these Y chromosomes do not share common ancestry with
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See more• Genetic Genealogy: About the use of mtDNA and Y chromosome analysis in ancestry testing
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See moreIn humans, the Y chromosome spans about 58 million base pairs (the building blocks of DNA) and represents almost 2% of the total DNA in a male cell. The human Y chromosome contains
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See moreWikipedia text under CC-BY-SA licenseWas this helpful?Thanks! Give more feedback In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by mutations in the non-recombining portions of DNA from the male-specific Y chromosome (called Y-DNA). Many people within a haplogroup share similar numbers of short tandem repeats (STRs) and types of mutations called single-nucleotide polymorphisms (SNPs).
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