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Haplogroup I-Z63, also known as I1a3 per the International Society of Genetic Genealogy ('ISOGG), is a Y chromosome haplogroup. It is correlated with a DYS456 value inferior to 15, but there are exceptions. [citation needed] I-Z63 is most common in England, Scotland, Germany, Fennoscandia [citation needed] and Poland. [1]
Haplogroup I-M438, also known as I2 (ISOGG 2019), is a human DNA Y-chromosome haplogroup, a subclade of haplogroup I-M170. Haplogroup I-M438 originated some time around 26,000–31,000 BCE. It originated in Europe and developed into several main subgroups: I2-M438*, I2a-L460, I2b-L415 and I2c-L596. [2]
The ISOGG tree has been described by academics as using the accepted nomenclature for human Y-chromosome DNA haplogroups and subclades in that it follows the Y Chromosome Consortium nomenclature as described in Karafet et al. 2008, [28] [29] [30] The ISOGG tree is widely cited in peer reviewed academic literature.
XYY syndrome, also known as Jacobs syndrome, is an aneuploid genetic condition in which a male has an extra Y chromosome. [1] There are usually few symptoms. [2] These may include being taller than average and an increased risk of learning disabilities. [1] [2] The person is generally otherwise normal, including typical rates of fertility. [1]
XYYY syndrome, also known as 48,XYYY, is a chromosomal disorder in which a male has two extra copies of the Y chromosome. The syndrome is exceptionally rare, with only twelve recorded cases. The presentation of the syndrome is heterogeneous, but appears to be more severe than its counterpart XYY syndrome.
The Y-Chromosome Consortium for many years left individual groups to maintain this standard. In 2008, they again published a comprehensive review of tree changes and retested samples. With this work, they strengthened their recommendation to move to a nomenclature system they referred to as shorthand ( Karafet 2008 ).
In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by specific mutations in the non-recombining portions of DNA on the male-specific Y chromosome (Y-DNA). Individuals within a haplogroup share similar numbers of short tandem repeats (STRs) and single-nucleotide polymorphisms (SNPs). [ 2 ]
Haplogroup C is a major Y-chromosome haplogroup, defined by UEPs M130/RPS4Y711, P184, ... ISOGG 2006: ISOGG 2007: ISOGG 2008: ISOGG 2009: ISOGG 2010: ISOGG 2011 ...