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How do you know whether you are male or female?
December 27, 2007New research published online this week in the open-access journal PLoS Biology investigates this basic and much-studied question in the fruit fly, and comes to a surprising new conclusion.
In mammals, male or female development depends on the presence of the Y chromosome, which is only found in males because it includes masculinizing genes. But other animal groups have evolved different systems. James Erickson and Jerome Quintero at Texas A&M University studied the mechanism of sex determination in the fruit fly, Drosophila melanogaster.
Previous studies in the fly suggested that it was the ratio of X chromosomes (the "female" chromosome, of which there are two copies in a female fly, and just one in a male) to the non-sex chromosomes (the autosomes) that determined the sex of a fly embryo. However, this new paper indicates that rather than being dependent on the ratio, it is the number of X chromosomes that is important. Sex is determined during a very specific and short stage in embryo development, and only two X chromosomes can produce enough of a signal to feminize the embryo during this window of opportunity.
http://www.plosbiology.org
Public Library of Science
http://www.plosbiology.org
Public Library of Science
Chromosomes Current Events and Chromosomes News RSSChildhood adversity may promote cellular aging
Children who suffer physical or emotional abuse could be faced with accelerated cellular aging as adults, according to new research published by Elsevier in Biological Psychiatry.
A better genetic test for autism
A large study from Children's Hospital Boston and the Boston-based Autism Consortium finds that a genetic test that samples the entire genome, known as chromosomal microarray analysis, has about three times the detection rate for genetic changes related to autism spectrum disorders (ASDs) than standard tests. Publishing in the April issue of Pediatrics (and online March 15), the authors urge that CMA become part of the first-line genetic work-up for ASDs.
Sequencing genome of entire family reveals parents give kids fewer gene mutations than was thought
Researchers at the University of Utah and other institutions have sequenced for the first time the entire genome of a family, enabling them to accurately estimate the average rate at which parents pass genetic mutations to their offspring and also identify precise locations where parental chromosomes exchange information that creates new combinations of genetic traits in their children.
Scientists solve puzzle of chickens that are half male and half female
A puzzle that has baffled scientists for centuries - why some birds appear to be male on one side of the body and female on the other - has been solved by researchers.
First whole genome sequencing of family of 4 reveals new genetic power
The Institute for Systems Biology (ISB) has analyzed the first whole genome sequences of a human family of four.
Infectious virus hidden in chromosomes during latency can be passed from parents to children
Human herpesvirus 6 (HHV-6) infects nearly 100 percent of humans in early childhood, and the infection then lasts for the rest of a person's life.
Asexual plant reproduction may seed new approach for agriculture
Farmers throughout the world spend an estimated $36 billion a year to buy seeds for crops, especially those with sought after traits such as hardiness and pest-resistance.
Modern man found to be generally monogamous, moderately polygamous
Did women and men contribute equally to the lineage of contemporary populations? Did our ancestors, Homo sapiens, lean more toward polygamy or monogamy?
Pesticide atrazine can turn male frogs into females
Atrazine, one of the world's most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females, according to a new study by University of California, Berkeley, biologists.
Cells of Aggressive Leukemia Hijack Normal Protein to Grow, According to Penn Study
Researchers have found that one particularly aggressive type of blood cancer, mixed lineage leukemia (MLL), has an unusual way to keep the molecular motors running. The cancer cells rely on the normal version of an associated protein to stay alive.
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Journal of Biological Chemistry :: DNA and Chromosomes :: by American Society for Biochemistry and Molecular Biology JBC Table of Contents Categories are now available as RSS feeds. Get weekly fresh updates of you TOC section of choice. The Journal of Biological Chemistry (JBC) is the most-cited biomedical research journal in the world. Building on over 100 years of research, the JBC continues to provide essential research for an international audience and a standard of excellence in the field of biochemistry.* Published Weekly, Over 38,000 Pages Annually* Papers of the Week Chosen for Superior Relevancy* "JBC News" Podcasts Spotlight Featured Articles and Include an Editorial Perspective* The "Classics" Highlight Important Articles from the JBC Archive* Minireviews Present Concise Summaries of Rapid Advances and Trends in BiochemistryKindle blogs are fully downloaded onto your Kindle so you can read... |
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Chromosome 6 by Robin Cook (Author) In his most prophetic novel, Robin Cook challenges the ethics of genetic manipulation and cloning. "Shocking and thought-provoking...Cook's best to date." (ssociated Press) |
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Evangelion Angel Chromosome XX Series Tabris Figure A-17 by Yamato Neon Genesis Evangelion A-17 Tabris. The girls of Eva take charge in WAVE's beautiful series of Angel Chromosome-XX PVC statues inspired by the popular anime Neon Genesis Evangelion. Measuring approximately 5 1/2-inches high, this interpretive series of statues includes the girls of Evangelion, all designed by manga artist Mine Yoshizaki, the talent behind the manga Sergeant Keroro. Each figure comes with detachable wings and added features such as interchangeable arms with weaponry and clear plastic parts, as well as custom designed DNA display bases. Even more, each comes packaged in a creatively themed laboratory sealed collector's box with views from front and back so that each figure can be seen without having to be removed, good news for die-hard collectors. Items sold... |
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Chromosomes & Genes Starring: Sunburst Visual Media Directed By: Sunburst Visual Media Modern society is being bombarded with new information about genetics every day! Make sure your students understand the key concepts that will enable them to fully understand this topic. Students are intrigued that genes can influence looks and behavior! |
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His & Hers Chromosome Towels - XX by T.R. Miller Co., Inc. Geeks understand the importance of towels. And sometimes two geeks get together and live in the same house. Know what that leads to? Towel fights. Not the sort where you wet one end and snap it, but fights over whose towel is whose. First, we thought we'd solve that the same way nations do. But it's impractical to stick flags in towels. They never stay upright, and then the nylon gets all wet, and it's just a bad scene all around. So we went with the monogram option. Choose your towel by the applicable set of sex chromosomes. And voila! No more towel confusion. We're afraid if you live in a single sex dorm, this isn't going to help. Unless you're the only science-y one there. And then, score! |
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Chromosomes 1-22, X & Y Chromosomes, & 11 Chromosome Materials CD-ROM by US National Library of Medicine Chromosomes 1-22, X & Y Chromosomes, & 11 Chromosome Materials CD-ROM |
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SEPHORA COLLECTION Colorful Eye Shadow Palette Chromosome X 10 by SEPHORA COLLECTION What it is:A palette of four coordinated eyeshadows in a circular compact, plus a double-ended applicator.What else you need to know:Each lush shade glides on with a silky, stay-put texture that can be used wet or dry to create a multitude of options and is enriched with green tea to soothe the delicate eye area. |
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