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Men missing Y chromosomes in blood cells should probably receive more frequent cancer screening, he suggested.
In the future, it may be possible to use this approach to take cells from a patient that has a defective chromosome with multiple missing or duplicated genes and rescue those cells by removing the defective chromosome and replacing it with a normal chromosome, said senior author Anthony Wynshaw-Boris, MD, PhD, James H.
Wilson Sayres from the University of California, Berkeley said that the Y chromosome has lost 90 percent of the genes it once shared with the X chromosome, and some scientists have speculated that the Y chromosome will disappear in less than 5 million years.
Summary: TEHRAN (FNA)- The discovery and analysis of an extremely rare African American Y chromosome pushes back the time of the most recent common ancestor for the Y chromosome lineage tree to 338,000 years ago.
Ring chromosomes are divided into two groups: those in which one normal chromosomal homologue is replaced by a ring equivalent, and those in which the ring chromosome is additional to the two normal copies of that chromosome; such a ring is termed a supernumary.
Chromosomes in sedges and other organisms that undergo post-reductional meiosis are holocentric, meaning that centromeric activity is distributed along the entire chromosome (Hakansson, 1954).
This swapping of portions leads to alteration of genetic information content in the resulting chromosomes.
Both people and papayas have specialized chromosomes that carry genes that determine the gender of their offspring.
Using evidence from the distribution of the Y Chromosomes, Jeffrey T.
But if early research under way in Chicago, New York City, Melbourne, and other sites around the world bears fruit, there may someday be "heterosexual-free" fertilization techniques that combine the chromosomes of two same-sex partners, resulting in embryos composed genetically from both men or both women.
These billions of DNA bases are located on 23 pairs of chromosomes which are harbored in nearly every human cell.
As the Human Genome Project moves forward quickly to compile sequences of all 23 human chromosomes -- a result expected to be announced later this year -- one challenge for scientists will be to interpret that enormous mass of information.
Maps, by establishing the location, order, and relative distance of genes, anonymous DNA markers, and biologically important traits along a species' chromosomes, are critical tools in analyzing genetic contribution to a given disease state.