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 ?
At first glance, the experiments would seem to suggest Y chromosomes aren't necessary for reproduction, which hints that evolution may eventually show Y's the door.
At that time, when mammals were evolving from their common ancestors with reptiles and birds, what are now the X and Y chromosomes were a pair of autosomes similar to today's X chromosome.
Using evidence from the distribution of the Y Chromosomes, Jeffrey T.
Using some 30 natural genetic markers, Chris Tyler-Smith of the University of Oxford in England and his colleagues classified the Y chromosomes of more than 2,100 men from locations across Asia.
The researchers obtained Y chromosomes by extracting them from cell samples scraped from the men's mouths.
The Science paper Underhill co-authored described the Y chromosomes of more than 1,000 men in 25 different Middle Eastern and European geographic regions.
Y chromosomes are probably lost when cells divide, with some cells failing to divvy up their chromosomes equally.
The product includes probes to identify cells containing fetal and adult forms of hemoglobin mRNA, providing a method of identifying fetal cells, as well as probes to identify the X and Y chromosomes.
That sex chromosome is so new evolutionarily that it doesn't have the stripped-down style of full-fledged Y chromosomes.
The researchers used 167 chemical markers to probe alterations of nucleotide sequences in the Y chromosomes in modern men.
Yet, she says, "they looked just the same" but carried special Y chromosomes inherited from their mothers.