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Latest Karyotype Stories

2014-06-17 13:41:26

University of Texas at Arlington A UT Arlington research team says their study of genetic information from more than 4,000 beetle species has yielded a new theory about why some species lose their Y chromosome and others, such as humans, hang on to it. They call it the "fragile Y hypothesis." The biologists' idea is that the fate of the Y chromosome is heavily influenced by how meiosis, or the production of sperm, works in an organism. They believe the size of an area where X and Y...

2014-04-18 15:41:30

Researchers propose classification system revolutionizing communication of chromosomal abnormalities for research and clinical settings When talking about genetic abnormalities at the DNA level that occur when chromosomes swap, delete or add parts, there is an evolving communication gap both in the science and medical worlds, leading to inconsistencies in clinical and research reports. Now a study by researchers at Brigham and Women's Hospital (BWH) proposes a new classification system...

Chromosomal Evolution Advancement In Sea Cradles
2012-12-12 15:45:38

Pensoft Publishers The study of chromosome changes arisen during species evolution is a current and intriguing topic that evolutionary biology proposes. However, in several groups (for example, mollusks), and chitons in particular, chromosome studies are scarce, with a few species investigated and analyses performed mostly with simple methods. Only 2,5% of about 900 living species of chitons have been so far karyologically investigated, all of them in the same order (Chitonida). The...

Genetic Test Reveals More About Potential Birth Defects Than Conventional Methods
2012-12-06 11:43:12

Lawrence LeBlond for redOrbit.com - Your Universe Online Two new papers published in the New England Journal of Medicine (NEJM) show that genetic testing in early pregnancy reveals far more about potential birth defects and stillbirth risk than current prenatal testing does, based on a multi-center clinical trial using both methods. The clinical trials showed that 6 percent of certain fetuses declared normal by conventional prenatal tests were found to have genetic abnormalities using...

A Look At The Early Evolution Of Sex Chromosomes
2012-08-06 18:24:30

Two new studies offer insight into sex chromosome evolution by focusing on papaya, a multimillion dollar crop plant with a sexual problem (as far as growers are concerned) and a complicated past. The findings are described in two papers in the Proceedings of the National Academy of Sciences. The research reveals that the papaya sex chromosomes have undergone dramatic changes in their short evolutionary histories (they are about 7 million years old; by comparison, human sex chromosomes...

Does Polyploidy Play A Role In The Italian Endemic Flora?
2012-05-22 08:24:01

Besides the obvious differences between plants and animals, subtle ones lie concealed within the cell, even within the nucleus. In both plant and animal cells, the nucleus contains DNA, which condenses into chromosomes during cell division. Chromosomes can be counted at that stage, revealing the chromosome number for each species. Here comes a difference: while the chromosome number spans a relatively short range across animal species (2-296: 46 in man), some plant species have over 1000...

2012-02-10 00:07:51

While both tests look for the same thing, chromosomal microarray finds more, says New York-Presbyterian/Columbia researcher who led nationwide study A nationwide, federally funded study has found that testing a developing fetus' DNA through chromosomal microarray (CMA) provides more information about potential disorders than does the standard method of prenatal testing, which is to visually examine the chromosomes (karyotyping). The results of the 4,000-plus-participant clinical study are...


Word of the Day
call-note
  • The call or cry of a bird or other animal to its mate or its young.
'Call-note' is newer than 'bird-call,' which originally referred to 'an instrument for imitating the note of birds' but now also refers to 'the song or cry of a bird.'
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