Y chromosome


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Y chromosome

or Y-chro·mo·some (wī′krō′mə-sōm′)
n.
The sex chromosome associated with male characteristics in mammals, not occurring in females and occurring with one X chromosome in the male sex-chromosome pair.

Y chromosome



n.
a sex chromosome of humans and most mammals that is present only in males and is paired with an Xchromosome. Compare X chromosome.
[1920–25]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Y chromosome - the sex chromosome that is carried by men; "human males normally have one X chromosome and one Y chromosome"
sex chromosome - (genetics) a chromosome that determines the sex of an individual; "mammals normally have two sex chromosomes"
References in periodicals archive ?
About 310 million years ago, there was no Y chromosome as we know it.
Some mammals have already lost their Y chromosome, though they still have males and females and reproduce normally.
The Y chromosome data generate a more precise estimate of colonization of the Americas than earlier DNA studies provided, the researchers contend.
"As far as the Y chromosome's evolution is involved, papaya obviously represents a very early step, probably the earliest studied now," says plant-sex chromosome specialist Boris Vyskot of the Czech Academy of Sciences in Brno.
Proponents of the so-called rotting Y theory have been predicting the eventual extinction of the Y chromosome since it was first discovered that the Y has lost hundreds of genes over the past 300 million years.
Even if losing the Y chromosome doesn't cause cancer, the event might signal that a man is at risk, said Forsberg.
The investigators say they have indirect evidence that Genghis Khan carried the Y chromosome variant that caught their eye.
Lell and his co-authors have recently refuted this single migration interpretation of Y chromosome data.
"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.
28 Nature, two Australian scientists summarized recent research showing that the human Y chromosome gradually accumulates mutations that deactivate its few genes.