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Human Y chromosome much older than previously believed

Geneticists from the University of Arizona have discovered a rare Y chromosome, the hereditary factor for determining male sex, that dates back 380,000 years. Originally, a DNA sample obtained from an African American living in South Carolina was submitted to the National Geographic Genographic Project. When none of the genetic markers

Fossil virus found in songbird chromosomes

Fragments of a 19 million-year-old virus have been found in the chromosomes of songbirds. DNA analysis indicates these viral remnants are ancient hepadnaviruses, a family of DNA viruses that includes the hepatitis B virus (HBV), which infects roughly one-third of the world's human population, causing a variety of acute and