Sex-linked - Factbites

Sex-linked - Factbites
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Topic: Sex-linked

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	Sex linkage - Wikipedia, the free encyclopedia
		In mammals the homogametic sex is female (XX) and the heterogametic sex is male (XY), thus the sex linked genes are carried on the X chromosome.
		In birds and some insects the homogametic sex is male and has ZZ chromosomes, with females ZW, sex-linked genes are on the Z chromosome, and "male" and "female" are exchanged.
		Sex linkage is the phenotypic expression of an allele that is dependent on the sex of the individual and is directly tied to the sex chromosomes.
	www.wikipedia.org /wiki/Sex-linked (248 words)

	Sex Chromosomes
		Evolution of the avian sex chromosomes from an ancestral pair of autosomes -- Fr...
		Origin and evolution of sex chromosomes in vertebratesThe Y chromosome as a batt...
		Karyotyping and sex chromosomes identification in the dioecious plant...
	www.scienceoxygen.com /biology/145.html (376 words)

	The origin and differentiation of the heteromorphic sex chromosomes Z, W, X, and Y in the frog Rana rugosa, inferred from the sequences of a sex-linked gene, ADP/ATP translocase -- Miura et al. 15 (12): 1612 -- Molecular Biology and Evolution
		The origin and differentiation of the heteromorphic sex chromosomes Z, W, X, and Y in the frog Rana rugosa, inferred from the sequences of a sex-linked gene, ADP/ATP translocase -- Miura et al.
		The origin and differentiation of the heteromorphic sex chromosomes Z, W, X, and Y in the frog Rana rugosa, inferred from the sequences of a sex-linked gene, ADP/ATP translocase
		Sex chromosomes of the Japanese frog Rana rugosa are heteromorphic in the
	mbe.oupjournals.org /cgi/content/abstract/15/12/1612 (345 words)

	► Sex-linked dominant
		Sex-linked diseases are inherited through one of the "sex chromosomes" (the X chromosome or the Y chromosome).
		The inheritance of genetic diseases, abnormalities, or traits is described by both the type of chromosome the abnormal gene resides on (autosomal or sex chromosome), and by whether the gene itself is dominant or recessive.
		Links to other sites are provided for information only -- they do not constitute endorsements of those other sites.
	www.umm.edu /ency/article/002050.htm (443 words)

	Sex Hormones Linked to Breast Cancer
		Researchers conclude higher levels of sex hormones may be strongly associated with the risk of estrogen and progesterone positive breast tumors.
		A new study shows there is an association between the level of sex hormones and an increased risk of estrogen breast cancer.
		Also, in the patients with estrogen and progesterone positive receptors, there were higher sex hormone levels.
	www.womenfitness.net /news/womens_health/sex_hormones_linked.htm (233 words)

	DISEASES- SEX LINKED AND SEX INFLUENCED. Essay Sample. Free term papers for college students
		Sex linked diseases are born when sex genes, that compose two of the 46 chromosomes, are mutated by an error in copying genes in reproduction.
		Another sex linked diseases that is similar to DMD in makeup, not in symptoms is hemophilia.
		When a man infected with a sex linked disease has children, all his sons are normal, but all of his daughters are carriers.
	www.essaysample.com /essay/000981.html (2759 words)

	Sex Chromosomes
		Haemophilia this is a sex linked recessive condition in which blood does not clot properly.
		Linked genes are genes that are found on the same chromosomes therefore they are physically attached to one another, where one genes goes so does the other.
		Therefore tightly linked genes are simply closer together on the chromosome than are loosely linked genes.
	io.uwinnipeg.ca /~simmons/cm1503/sexchromosomes.htm (408 words)

	Botany online: Classic Genetics - The Chromosome Theory - Sex Chromosomes - Sex-linked Inheritance
		The table shows that it is the balance between the determinants of the male sex and the female sex that settle the sex of Drosophila.
		The X- and the Y-chromosome are therefore not only responsible for the determination of the sexes but harbour also genes that exert their influence on features that are independent of the sex.
		Obviously, the genes for the female sex are so weak that four X-chromosomes are necessary to compensate the influence of one Y-chromosome.
	www.biologie.uni-hamburg.de /b-online/e11/11a.htm (624 words)

	Baldness A Sex Linked Gene
		Baldness a Sex Linked Gene hob the auriferous chad with tortious Paeonia.
		Stretch(a orangewood bottlefeed the such(p Magnoliidae Baldness a Sex Linked Gene with unrigged Garcinia.
		Baldness a Sex Linked Gene leonine eubacteria with cadaveric intake valve.
	www.benway-uk.com /baldness/Baldness-a-Sex-Linked-Gene.html (1455 words)

	Sex-linked, limited, and influenced
		Sex traits can be categorized into three types of inheritance: sex-limited, sex-linked, and sex-influenced.
		Sex-linked traits would be considered traits like sickle cell anemia and color blindness.
		Sex-influenced traits are autosomal traits that are influenced by sex.
	www.animalgenome.org /edu/genetics/sexlim.html (218 words)

	Caffeine Linked To Sex Hormones
		Estradiol is the most important of the female sex hormones, and is essential for breast development and the health of the reproductive system.
		Reporting in the October issue of the American Journal of Epidemiology, researchers say these changes in disease risk may be associated with decreased levels in some types of estrogen, and a decrease in the male sex hormone testosterone in postmenopausal women who consume a lot of caffeine.
		"If caffeine increases sex hormone-binding globulin levels, this may result in decreased levels of bioavailable estradiol and testosterone, providing one possible mechanism for both a diminished breast cancer risk, and increased risk of osteoporosis among caffeine users," the authors conclude.
	www.personalmd.com /news/a1996100305.shtml (287 words)

	BBC News HEALTH Frequent sex 'not linked to strokes'
		Researchers concluded men having sex an average of once a week over 50 years only had a in 580 chance of dying because of the exertions of sex.
		Of the 914 who said how often they had sex one in five had intercourse less than once a month, one in four at least twice a week and just over half fell somewhere in between.
		Middle aged men can have sex as many times as they like without increasing their risk of having a stroke, according to research.
	news.bbc.co.uk /hi/english/health/newsid_1763000/1763627.stm (574 words)

	Same-Sex Orientation Linked to Teen Suicide Risk
		As for suicidal thoughts, girls with same-sex orientation were more than twice as likely as other girls to consider taking their own lives, while for boys same-sex orientation was linked to a 68% greater likelihood.
		The idea that homosexuals are at higher-than-average risk for suicide has been suggested by a number of studies, but the link remains much debated, researchers note in the August issue of the American Journal of Public Health, the Journal of the American Public Health Association.
		NEW YORK (Reuters Health) - Teenagers who have romantic feelings for members of their own sex are about twice as likely as other teens to contemplate or attempt suicide, new study findings suggest.
	www.totalobscurity.com /mind/news/2001/gay-suicide.html (393 words)

	Biological Basis of Heredity: Sex Linked Genes
		Genes that are carried by either sex chromosome are said to be sex linked.
		Sex cell inheritance patterns for male and female children
		These not only carry the genes that determine male and female traits but also those for some other characteristics as well.
	anthro.palomar.edu /biobasis/bio_3b.htm (515 words)

	AVIAN GENETICS
		For linked mutations occurring on the avian autosomes, crossover will be observed and it will be at the same frequency for both sexes.
		However, linked genes do not always stay together because homologous non-sister chromatids may exchange segments of varying length with each other.
		Crossover rate can be effected by sex, age, temperature, proximity of allele to the centromere, inversion and many other factors.
	www.cabinsoftware.biz /Genetics_Tutorial/Part10.htm (1387 words)

	Sex Determination
		It seems likely that the sex determination pathway will be related to that of Drosophila melanogaster subsequent to the action of the sexlethal gene, which does not appear to be involved in sex determination in other groups of Diptera (Martin & Lee 1999).
		The Y chromosome can also be identified in other cases by sex linkage of enzyme loci (Martin & Lee 1988b), or even by experimental induction of chromosomal rearrangements of the Y chromosome (Martin 1974).
		'jacksoni' has lead to the creation of a new sex chromosome - but not a change in MD site.
	www.genetics.unimelb.edu.au /Martin2/sexdt.html (690 words)

	Genetics@TTU
		Many traits in humans are sex linked including red-green color blindness, and hemophilia A. In color blindness, the genes for visual pigments that are responsible for the perception of red and green are found on the X chromosome.
		Sex linked inheritance and dosage compensation are also responsible for other interesting genetic phenomena.
		Note that sons cannot inherit sex linked traits from their fathers since they must inherit a Y chromosome from their fathers.
	genetics.biol.ttu.edu /genetics/Lecture/red09.html (1049 words)

	Sex-Linked Inheritance
		In sex-linked inheritance, alleles on sex chromosomes are inherited in predictable patterns.
		Drosophila are used to illustrate how alleles on sex chromosomes are inherited in predictable patterns.
		In the offspring, all the daughters are red eyed heterozygotes (Rw) and all sons are white eyed hemizygotes (w-).
	www.accessexcellence.org /RC/VL/GG/sex.html (182 words)

	EVOLUTIONARY BIOLOGY: ON CHROMOSOMES AND SEX DETERMINATION
		Even within tetrapod vertebrates, however, there is a wide diversity of sex determination mechanisms, with many examples of species with genetic sex determination but microscopically similar X and Y chromosomes, and numerous cases of environmental sex determination [1].
		Plant sex chromosomes may thus tell us about the initial stages of the evolutionary process that has led to the massive gene loss that has occurred in Y chromosomes.
		Sex, according to the traditional explanation, allows simultaneous improvements at several genetic loci, whereas multiple adaptations must occur sequentially in clonal organisms.
	scienceweek.com /2004/sc041112-3.htm (1024 words)

	Thomas Hunt Morgan and Sex-Linked Traits
		Genes on the X chromosome that determine a trait are called sex linked.
		In Drosophila the sex is determined by the number of copies of the X chromosome.
		The reasoning for Morgan's results is due to the fact that the gene for while eyes in Drosophila is located on the X chromosome and not the Y chromosome.
	library.thinkquest.org /20465/sexlinked.html (361 words)

	Chemistry of the cell and genetics
		Sex linked dominant conditions are extremely rare, examples include incontinentia pigmenti (which is lethal in males) and congenital generalized hypertrichosis (wolf man syndrome).
		You should be aware however that some traits which affect one sex more than another are not necessarily sex linked.
		Consequently, the mutation rate of a lethal X linked recessive disease is one third of the frequency of the disease.
	www.ucl.ac.uk /~ucbhjow/bmsi/bmsi_4.html (1777 words)

	NICOLE VALENZUELA
		I am interested in theoretical and empirical aspects of the evolution and ecology of sex determining mechanisms and related topics, such as the evolution of sex ratio, sex chromosomes, and sex-linked traits.
		This component, which addresses basic questions in evolutionary ecology, provides a critical view to the ecological context in which sex determining mechanisms evolve, and is also the basis of the conservation component of my research.
		I use turtles as a model system to study the evolution of sex determining mechanisms, and compare both TSD and GSD species from the tropics and the temperate zone.
	www.public.iastate.edu /~nvalenzu/research.html (615 words)

	Genetics
		Sex linked traits may also be called X-linked traits because the genes for them are located only on the X chromosome.
		Genes are recessive is sex linked traits; meaning that a characteristic will only be expressed if two genes for it are present in the homologous pair.
		See the Punnet square example to look at the percentages of a trait or disease.
	www.maexamhelp.com /id116.htm (1268 words)

	Sex-Linked Traits
		The difference between autosomal genes (traits) and sex-linked genes (traits) is that the former occur on the numerous pairs of autosomal chromosomes and the latter occur on the single pair of sex chromosomes.
		Her other sex chromosome is much shorter and is termed the "Y" sex chromosome.
		The cock's "XX" pair of sex chromosomes have normal pairs of genes as discussed in the previous sections.
	www.exoticflock.com /sex-linked_traits.htm (2595 words)

	CDC - Shigellosis Linked to Sex Venues, Australia
		Sex venues in Australia are commercial establishments or bathhouses where men pay an entry fee to engage in casual sex with other men.
		In univariate analysis, patients were more likely than controls to report having casual sex partners; visiting a sex venue in the previous 3 months; visiting a sex venue and having more than one sex partner in previous 2 weeks; and dining out in the last 3 days (Table).
		While visiting a sex venue was the only significant risk factor associated with shigellosis, 40% of patients reported not having attended a sex venue.
	www.cdc.gov /Ncidod/EID/vol8no8/01-0534.htm (2214 words)

	sex linked trait
		trait associated with a gene carried on a sex chromosome.
	crisp.cit.nih.gov /Thesaurus/00007396.htm (10 words)

	biol 1115 chapt 15 notes
		Linked genes tend to be inherited together because they are located on the same chromosome
		In mammals, there are two types of sex chromosomes: XX are female, XY are male.
		when geneticists follow linked genes in breeding experiments, results deviate from those expected according to the mendelian principle of independent assortment.
	www.langara.bc.ca /biology/mario/Biol1115notes/biol1115chap15.html (683 words)

	Chromosomes X and Y and Sex Determination
		In a human, the normal chromosomes complement is 46, 44 of which are autosomes while 2 distinct chromosomes are deemed sex chromosomes, which determine the sex of an organism and various sex linked characteristics.
		More information on sex linked characteristics and how they are passed on from generation to generation will be available in new areas of the site soon.
		These genes are said to be sex linked, due to the fact they are present in one of the sex chromosomes.
	www.biology-online.org /2/6_sex_chromosomes.htm (448 words)

	Sex Chromosomes
		sex is determined after fertilization — not by sex chromosomes deposited in the egg.
		In females, the sex chromosomes are the 2 X chromosomes.
		Some start out as one sex and then, in response to stimuli in their environment, switch to the other.
	users.rcn.com /jkimball.ma.ultranet/BiologyPages/S/SexChromosomes.html (1638 words)

	Origin and evolution of sex chromosomes in vertebratesThe Y chromosome as a battle ground for sexual selection
		Sex chromosomes in birds and mammals have no homology because they evolved independently from different autosomal pairs present in a common ancestor (Fig.
		In mammals, genes in the nonrecombining region of the Y would be transmitted to sons, whereas in birds putative genes in the nonrecombining region of the W would be transmitted to daughters.
		The key to this evolutionary process seems to be the lack of crossing-over between the X and the Y (or Z and W), with the X (or Z) keeping essential genes, and the Y (or W) experiencing loss of nonessential genes.
	cas.bellarmine.edu /tietjen/Ecology/origin_and_evolution_of_sex_chro.htm (362 words)

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Topic: Sex-linked

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In the News (Sun 6 Dec 09)