SCIENCE IN THE NEWS DAILY
Ancestry Testing Goes for Pinpoint Accuracy
from Nature News
Condoleezza Rice, former US Secretary of State and national security adviser, ought to be a tough woman to surprise. Yet when Henry Louis Gates Jr, host of a US television series called Finding Your Roots, revealed that nearly half of her genetic ancestry could be traced to Europe, Rice, an African American, told Gates, "I'm stunned."
Although it is no secret that many African Americans have some European ancestry--a legacy of the transatlantic slave trade--advances in DNA analysis are beginning to provide more detailed insight for individuals. Commercial ancestry testing, once the province of limited information of dubious accuracy, is taking advantage of whole-genome scans, sophisticated analyses and ever-deeper databases of human genetic diversity to help people to answer a simple question: where am I from?
Until a few years ago, most ancestry tests for individuals relied on short stretches of DNA in cell-powering organelles called mitochondria, which are inherited through the mother, or on the Y chromosome, which a father passes down to his sons. As humans fanned out from Africa some 40,000 to 80,000 years ago and populated the world, mitochondria and Y chromosomes developed specific changes that were tied to different populations. Yet these 'uniparental markers', which chart an unbroken chain back through either the maternal or paternal line, are rarely unique to a population.
Connect With Us:
PODCAST & VIDEO: Engineering Around Extreme Events
Extreme events, such as super floods and hurricanes, are becoming more common, so civil engineers are trying to adapt civil infrastructure such as bridges to these unpredictable and sometimes devastating meteorological events. Engineer Ana Barros discusses how engineering can prepare us for extreme weather events, but also how changing climate and population conditions can affect the ability of infrastructure to hold up over time.
To view all multimedia content, click "Latest Multimedia."
Receive notification when new content is posted from the entire website, or choose from the customized feeds available.