a sex chromosome of humans and most mammals that is present only in males and is paired with anXchromosome. CompareX chromosome. [1920–25] Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved...
In humans, sex is determined by two chromosomes: an X-chromosome, which is female, and a Y-chromosome, which is male. (Seesex chromosomes.) add this widget to your site Did You Know? Tuxedo was given its name after gaining popularity among diners at Tuxedo Park, NY. ...
Cammarata, M., Di Simone, P., Graziano, L., Giuffrè, M., and Corsello, G. (1999) Rare sex chromosome aneuploidies in humans: report of six patients with 48,XXYY,49, XXXXY, and 48,XXX karyotypes.Am. J. Med. Genet.85, 86–87. CASPubMedGoogle Scholar Gorlin, R.J. (1977) Cla...
Cammarata M, Di Simone P, Graziano L, Giuffrè M, Corsello G. Rare sex chromosome aneuploidies in humans: report of six patients with 48,XXYY, 49,XXXXY, and 48,XXX karyotypes. Am J Med Genet. 1999;85:86–7. ArticlePubMedCASGoogle Scholar Gorlin RJ. Classical chromosome disorders. In:...
核型图中的最后一对染色体没有编号,它们以X和Y做标记。X比Y要大很多。XY上有部分基因同源,Y上有决定男性发育的基因。其他1-22号是常染色体(autosome)。核型图可以用于鉴定性别以及是否有染色体异常,比如唐氏综合征(21三体综合征,原因是减数分裂过程中染色体不分离,non-disjuction)。
The XY Sex Determination System Chromosomes are made of proteins and DNA organized in genes. Chromosomes are responsible for passing genetic information from generation to generation. The number of chromosomes in eukaryotic organisms (organisms with a nucleus) varies by species. Some species have a ...
among six nematode species with chromosome-level genome assemblies, other thanC. elegans, organised according to the phylogeny. Nodes inferred to have had XY systems (which we infer to be the ancestral state, see the section of ‘Evolution of sex-linked gene transcription’ in the main text) ...
that drives the evolution of an XY system, but if a dominant male-sterility mutation fixes, then a ZW system evolves [7]. XY systems are more common, which could be due to stronger selection in males, which drives faster evolution of the Y [7] and makes the Z chromosome more male-bia...
Sex chromosomes are those chromosomes that influence sex determination. In mammals, including humans, the X and Y chromosomes are the sex chromosomes (females are XX, males XY). The chromosomes which do not encode for sex are called autosomal....
that drives the evolution of an XY system, but if a dominant male-sterility mutation fixes, then a ZW system evolves [7]. XY systems are more common, which could be due to stronger selection in males, which drives faster evolution of the Y [7] and makes the Z chromosome more male-bia...