Y chromosome

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Y chromosome

[′wī ′krō·mə‚sōm]
(genetics)
The sex chromosome found only in the heterogametic male sex, as in mammals and Drosophila.
References in periodicals archive ?
At least two species of rodents have already jettisoned their Y chromosomes entirely.
Also unknown is when the mammalian X and Y chromosomes evolved.
For this reason, recent studies have attempted to utilize the paternally inherited Y chromosome as well as biparentally inherited autosomal genetic markers to study the relatedness and histories of populations.
Losing the Y chromosome in blood cells may bring on cancer and shorten men's lives, new research suggests.
Deborah Charlesworth of the University of Edinburgh says, "It is not rash to call this a Y chromosome or at least an evolving Y." The findings support the evolutionary theories of how sex chromosomes arise, she adds.
"The problem is to be sure that this is the personal Y chromosome of Genghis Khan," adds Jaume Bertranpetit of the University of Pompeu Fabra in Barcelona.
The Y chromosome segments in the new analysis exhibit much less variability than DNA regions that have been studied in other chromosomes.
Comparing the sex chromosomes of six species, Hoekstra found that the XY females have forms of the Y chromosome unique to their species.
The male patient with the highest number of liver cells bearing the Y chromosome also had the most dire disease--recurrent hepatitis C.
An egg fertilized by a sperm carrying a Y chromosome becomes a boy.