Double X Science - It's In Your Genes

Search Results for: label/Y chromosome

  • Literal XX Xplainer: How we can live with two X chromosomes

    …ression of one X chromosome in each cell makes each woman a lovely mosaic of genetic expression (although not true genetic mosaicism), varying from cell to cell in whether we use genes from X chromosome 1 or from X chromosome 2. Because these gene forms can differ between the two X chromosomes, we are simply less uniform in what our X chromosome genes do than are men. An exception is men who are XXY, who also shut down one of those X chromosomes…

    Authored by on June 27, 2012

  • Are your children always on your mind? They may be IN your mind

    …7;s a post for another time). As you probably know, most women don’t carry a Y chromosome in their own cells (but some do; another post for another time). In this study, researchers examined postmortem brain tissue from 26 women who had no detectable neurological disease and 33 women who’d had Alzheimer’s disease; the women’s ages at death ranged from 32 to 101. They found that almost two thirds (37) of all of the women te…

    Authored by on September 26, 2012

  • Biology Explainer: The big 4 building blocks of life–carbohydrates, fats, proteins, and nucleic acids

    …molecules themselves break down into a surprisingly small number of building blocks. The proteins that make up all of the living things on this planet and ensure their appropriate structure and smooth function consist of only 20 different kinds of building blocks. Nucleic acids, specifically DNA, are even more basic: only four different kinds of molecules provide the materials to build the countless different genetic codes that translate into all…

    Authored by on June 8, 2012

  • After Newtown missteps, journalists get guidelines

    …almost twice as likely to say that they don’t want to live or work near a person with mental illness if they read an article about a person with mental illness involved in a mass shooting, according to a study published March 20 in the American Journal of Psychiatry. Interestingly, this tendency is the same even if the article avoids any mention of mental illness. This may be because this link between violence and mental illness is deeply engrain…

    Authored by on March 27, 2013

  • Anorexia nervosa, neurobiology, and family-based treatment

    sume eating. If they were still alive. Bruch’s observations dictated eating-disorders treatments for decades, treatments that led to spectacularly ineffective results. Only about 35% of people with anorexia recovered; another 20% died, of starvation or suicide; and the rest lived with some level of chronic illness for the rest of their lives. Not a great track record, overall, and especially devastating for women, who suffer from anorexia at a ra…

    Authored by on August 10, 2012

  • Mother’s Day: Part of me forever

    Always a part of each other. (Source) Double X Science’s Chris Gunter, science education and outreach editor, wrote this wonderful post for the Last Word on Nothing. We are featuring it here for Mother’s Day because, as she writes, if you’re a mother, you and your child are part of each other forever–and this time, we mean in a scientific sense. Source. This summer I put my Lilkid, as I call him online…

    Authored by on May 12, 2012

  • Pregnancy 101: Fertilization is another way to come together during sex

    Human ovum (egg). The zona pellucida is a thick clear girdle surrounded by the cells of the corona radiata (radiant crown). Via Wikimedia Commons. It was September of 2006. Due to certain events taking place on a certain evening after a certain bottle (or two) of wine, my body was transformed into a human incubator. While I will not describe the events leading up to that very moment, I will dissect the way in which we propagate our…

    Authored by on December 3, 2011

  • Cottoning on to genome duplications

    Cotton, courtesy of the USDA. What do electrons have to do with our ability to spin this into yarn? Image via Wikimedia Commons.   by Chris Gunter, Science Education Editor, DXS   Plants are hard. Not in the physical way, but in the genomics way: It’s been estimated that 75% of domesticated plant genomes are polyploid, meaning they have up to 12 sets of each chromosome in every cell. This makes genome sequencing crazily diffi…

    Authored by on December 19, 2012

  • Is the bar high enough for screening breast ultrasounds for breast cancer?

    …n controversial. What’s new is the “Are You Dense?” patient movement and legislation to inform women that they have dense breasts. Merits and pitfalls of device approval The approval of breast ultrasound hinges on a study of 200 women with dense breast evaluated retrospectively at 13 sites across the United States with mammography and ultrasound. The study showed a statistically significant increase in breast cancer detection when ultrasound was…

    Authored by on September 21, 2012

  • Unicorns and Brainbows

    Brainbow is a mouse with a rainbow brain. By Jeffrey Perkel    A couple weeks ago I wrote about the beautiful world right under our noses, a world visible only under the microscope. The cover image for that post was this picture, a “‘Brainbow’ transgenic mouse hippocampus,” which placed 18th in the 2008 Nikon Small World Photomicroscopy contest. Brainbow technology also won the 2007 Olympus Bioscapes contest, with this be…

    Authored by on May 6, 2013

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