XY sex determination system

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	X chromosome - Wikipedia, the free encyclopedia
		Chromosomal conditions involving the sex chromosomes often affect sex determination (whether a person has the sexual characteristics of a male or a female), sexual development, and the ability to have children (fertility).
		The sex chromosomes are one of the 23 pairs of human chromosomes.
		The X chromosome is one of the two sex chromosomes in humans and other animals (the other is the Y chromosome).
	en.wikipedia.org /wiki/X_chromosome (1068 words)

	Encyclopedia: X
		The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals.
		The MPAA film rating system is a system used in the United States and instituted by the Motion Picture Association of America to rate a movie based on its content.
		Semiotics - also known as semiology - is the study of signs, both individually and grouped in sign systems, and includes the study of how meaning is transmitted and understood.
	www.nationmaster.com /encyclopedia/X (6962 words)

	Sex-determination system - Hutchinson encyclopedia article about Sex-determination system
		Most fish have a very flexible system of sex determination, which can be affected by external factors.
		In humans, sex is determined by the male.
		In many species, the sex of an individual is dictated by the two sex chromosomes (X and Y) it receives from its parents.
	encyclopedia.farlex.com /Sex-determination+system (277 words)

	Millennia still mean early days for newly identified sex chromosome
		In new work, Dr. Catherine Peichel and colleagues at the Fred Hutchinson Cancer Research Center, along with Dr. David Kingsley and colleagues at the Stanford University School of Medicine, have found that threespine stickleback fish have a genetic sex-determination system in which females are XX and males are XY.
		The evolution of a genetic sex-determination system is often accompanied by the evolution of sex chromosomes.
		Some experimental data from young sex chromosome systems in plants and insects suggest that there are common themes underlying the formation of sex chromosomes.
	www.eurekalert.org /pub_releases/2004-08/cp-msm081704.php (355 words)

	World History :: Encyclopedia Index -- Xy
		INDEX OF ARTICLES: Xy Articles are indexed by the first word of the title, including "A," "The," etc.
		World History :: Encyclopedia Index -- Xy Events Encyclopedia Localities Companies Surnames Shop
	www.worldhistory.com /wiki/Xy.htm (80 words)

	XY
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	www.omniknow.com /common/wiki.php?in=en&term=XY (232 words)

	Talk:Sex-determination system - Wikipedia, the free encyclopedia
		I have read information to the effect that the WW:WZ system for birds AND snakes, (i'm not sure about insects) is a reverse xy system in that as the articles says two of the same chromosomes are needed for male determination, instead of the XX style in human.
		From the definition, one could conclude that a sex-determination system is a method that, when applied to a certain individual, tells you whether that individual is a male or a female.
		In that sense, a sex-determination system for dogs would be "look if you can find testicles".
	www.wikipedia.org /wiki/Talk:Sex-determination_system (312 words)

	MCDB 2150 -- Lecture 11
		XY males are hemizygous: One of the features of an X/Y sex chromosome system is that females have two copies of the X chromosome, one of which is inherited from each parent, whereas males have only one, inherited from the mother, and paired with a Y chromosome inherited from the father.
		Patterns of inheritance: In this lecture, we will focus primarily on patterns of inheritance in the XX/XY system in mammals, including humans, and in Drosophila, with some brief references to other systems.
		However, individuals of both sexes normally express low levels of the hormones associated primarily with the other sex, and cases can be found within the usually accepted range of normalcy where there is some degree of expression of facial hair in women or breast enlargement in men.
	www.colorado.edu /MCDB/MCDB2150Fall/notes/L11.html (312 words)

	XY sex-determination system - Wikipedia, the free encyclopedia
		The XY sex determination system was first described independently by Dr. Nettie Stevens and Edmund Beecher Wilson in 1905.
		In the XY sex-determination system, females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY).
		The XY sex-determination system is a well-known sex-determination system.
	en.wikipedia.org /wiki/XY_sex-determination_system (312 words)

	Sex-determination system - Wikipedia, the free encyclopedia
		The most familiar sex-determination system is the XY sex-determination system found in human beings and most other mammals.
		A sex-determination system is a biological system that determines the development of sexual characteristics in an organism.
		The WZ sex-determination system is found in birds and some insects and other organisms.
	en.wikipedia.org /wiki/Sex-determination_system (312 words)

	PAG-XI-P662: SEX CHROMOSOME MARKERS IN PACIFIC SALMON (Oncorhynchus spp.)
		Pacific salmon possess an XY sex determination system where the two sex chromsomes are still largely homologous and heteromorphic structure in the vicinity of the sex-determination locus (the differential region) is difficult to identify cytogenetically.
		In family crosses, the markers were found by PCR analysis to be tightly linked to the sex-determination locus (SEX) on the Y chromosome.
		Despite their close linkage with SEX in the four species examined, neither of the two markers are sex-linked in sockeye salmon, rainbow trout or Atlantic salmon indicating that this linkage was established after the early radiation of the Pacific salmon.
	www.intl-pag.org /pag/11/abstracts/P5o_P662_XI.html (312 words)

	XY sex-determination system - Wikipedia, the free encyclopedia
		The XY sex determination system was first described independently by Dr. Nettie Stevens and Edmund Beecher Wilson in 1905.
		In the XY sex-determination system, females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY).
		The XY sex-determination system is a well-known sex-determination system.
	en.wikipedia.org /wiki/XY_sex-determination_system (264 words)

	Chromosomal Sex Determination.
		In chromosomal sex determination, the assortment of chromosomes during metaphase of Meosis I ensures that exactly half the male gametes contain X chromosomes, and exactly half contain Y. This system produces 50% males and 50% females.
		In butterflies and birds, females are the heterogametic sex (females are ZW, males are WW).
		In humans, XX is female vs. XY male
	www.uic.edu /classes/bios/bios101/mating/tsld023.htm (264 words)

	Sex-determination system - Wikipedia, the free encyclopedia
		The most familiar sex-determination system is the XY sex-determination system found in human beings and most other mammals.
		In the WZ sex-determination system, the situation is reversed: females have two different kinds of chromosomes (WZ), and males have two of the same kind of chromosomes (ZZ).
		A sex-determination system is a biological system that determines the development of sexual characteristics in an organism.
	www.wikipedia.org /wiki/Gonosome (264 words)

	Sox3 Is Required for Gonadal Function, but Not Sex Determination, in Males and Females -- Weiss et al. 23 (22): 8084 -- Molecular and Cellular Biology
		from hypoplasia to XY sex reversal (11), and the absence of
		Campomelic dysplasia and autosomal sex reversal caused by mutations in an SRY-related gene.
		Expression of Sox3 throughout the developing central nervous system is dependent on the combined action of discrete, evolutionarily conserved regulatory elements.
	mcb.asm.org /cgi/content/full/23/22/8084 (5095 words)

	PAG-XI-P662: SEX CHROMOSOME MARKERS IN PACIFIC SALMON (Oncorhynchus spp.)
		Pacific salmon possess an XY sex determination system where the two sex chromsomes are still largely homologous and heteromorphic structure in the vicinity of the sex-determination locus (the differential region) is difficult to identify cytogenetically.
		In family crosses, the markers were found by PCR analysis to be tightly linked to the sex-determination locus (SEX) on the Y chromosome.
		Despite their close linkage with SEX in the four species examined, neither of the two markers are sex-linked in sockeye salmon, rainbow trout or Atlantic salmon indicating that this linkage was established after the early radiation of the Pacific salmon.
	www.intl-pag.org /pag/11/abstracts/P5o_P662_XI.html (278 words)

	Student's Study Guide for Lesson Twelve : Sex Determination, Chromosomes and Mosaicism
		A Punnett square for sex determination using the sex chromosomes.
		Among the sex chromosomes, men have XY and women have XX.
		There is no difference among the sexes because each individual is both sexes.
	www.synapses.co.uk /genetics/ssg12.html (1104 words)

	PAG-VIII: POLYPLOIDY IN MAMMALS: THE FIRST EVIDENCE OF A TETRAPLOID RODENT
		This desert specialist has a totally biarmed, 102-chromosome karyotype with pericentromeric heterochromatin and a XY sex determination system.
		Since diploid number is not exactly twice that of any closely related species living today, chromosome elimination (i.e., in the sex-chromosomes and in the pair with the secondary constriction) is presumed to have occurred during the evolution of this lineage.
		Although polyploidy in animals is believed to disrupt the balance of X chromosome relative to gene products normally maintained by dosage compensation, disomy for the sex chromosomes in T.
	www.intl-pag.org /pag/8/abstracts/pag8374.html (1104 words)

	Sex determination
		Flies have XY system, but XO are sterile males and Y does not determine sex, needed for sperm
		Pattern of sex-specific splicing in 3 sex determining genes
		Sexual orientation may be due to neuron clusters (INAH3) in hypothalamus??
	www.people.memphis.edu /~clessman/lect22.htm (1104 words)

	Human Anatomy Chapter 27 -- Evolution Atlas
		Humans (and all mammals) possess sex chromosomes, X and Y. Females are homogametic (i.e., homozygous for X: XX) and males are heterogametic (i.e., heterozygous: XY).
		Sex chromosomes are common in reptiles where either male or female can be the heterozygous sex, but sex chromosomes are often absent in amphibians and fish.
		The main functions of the reproductive system are to 1) reproduce, and 2) produce genetically diverse offspring.
	cwx.prenhall.com /bookbind/pubbooks/martini10/chapter27/custom2/deluxe-content.html (1104 words)

	Sex determination of Cannabis - Genetic, environmental, or both? - Marijuana Growing
		All sex-determination systems are enzyme/hormone/chemically controlled, but the triggering mechanisms for the determination systems vary from purely chromosome-controlled to purely environmental.
		The genetic-afficionado's approach is that it is determined at pollination, and they base their arguements on the human and mammal XX/XY chromosome-determination system.
		Some species have their sex determined by bacterial infections, and others again practice sex-changes, where they start out as one gender and changes sex during their lifetime.
	www.overgrow.com /edge/showthread/t-466228.html (1104 words)

	XX - TheBestLinks.com - Roman numeral, TheBestLinks.com:Disambiguation, XY sex-determination system, Chromosomes, ...
		XX - TheBestLinks.com - Roman numeral, TheBestLinks.com:Disambiguation, XY sex-determination system, Chromosomes,...
	www.thebestlinks.com /XX.html (1104 words)

	PAG-XI-W25: COMPARATIVE MAPPING OF SEX DETERMINING GENES IN TILAPIA
		Sex determination has been suggested to be controlled by an XY system in O.
		We identified a QTL for sex near three microsatellite markers (GM271, GM204, and GM354) using the nonparametric procedure in MapQTL4.0.
		mossambicus and by a WZ (female heterogametic) system in O.
	www.intl-pag.org /11/abstracts/W05_W25_XI.html (1104 words)

	Encyclopedia entries starting with XY
		XY sex-determination system - XyMTeX - Xyphoid process - XyWrite - XY - XYZ Affair - Xylem Tube EP - XYY - Xyronomys
	encycl.opentopia.com /X/XY (32 words)

	Wolbachia in Humans?
		infection, hence, when they reproduce, no Wolbachia are reproduced.) Pill bugs have a WZ sex-determination system, in contrast to the more common XY system found in humans.
		plants as corn and rye that the mitochondrion is responsible for skewing the sex ratio in
		Wolbachia benefits from this by skewing the sex ratio in favor of females.
	www.ejnerfulsang.com /Wolbachia.html (32 words)

	Pharyngula::Maybe Y chromosomes make you stupid…?
		(Ok, that was a lame, obscure, one-elective-in-repro-biology geek joke--mammals have an XY-chromosome sex-determination system, while birds by contrast have a WZ-chromosome sex-determination system.
		Seriously, though, PZ and coturnix--are the two systems totally independent, or does the recent literature on platypus sex chromosomes suffice to connect them, or is it still an open question?
		I think the answer is that they're independent -- synteny analysis shows that the avian sex chromosomes are not homologs of the mammalian sex chromosomes, as I recall.
	pharyngula.org /index/weblog/comments/maybe_y_chromosomes_make_you_stupid (32 words)

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