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Encyclopedia > Sex linkage

Sex linkage is the phenotypic expression of an allele that is related to the gender of the individual and is directly tied to the sex chromosomes. This mode of inheritance is in contrast to the inheritance of traits on autosomal chromosomes, where both sexes have the same probability of expressing the trait. Image File history File links Please see the file description page for further information. ... A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. ... Individuals in the mollusk species Donax variabilis show diverse coloration and patterning in their phenotypes. ... In genetics, an allele (pronounced al-eel or al-e-ul) is any one of a number of viable DNA codings occupying a given locus (position) on a chromosome. ... The gender symbols used to denote a male or female organism. ... A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. ... An autosome is a non-sex chromosome. ...


In mammals, the female is the homogametic sex, having two X-chromosomes (XX), while the male is heterogametic, having one X and one Y chromosome (XY). Genes that are present on the X or Y chromosome are called sex linked genes. I smoke weed im growing a blue penis dude#REDIRECT penises are cool ... The hand mirror and comb of the Roman Goddess Venus is often used to represent the female sex. ... The X chromosome is one of the two sex-determining chromosomes in many animal species, including mammals (the other is the Y chromosome). ...


In birds and in some insects, the homogametic sex is male. For example, a male duck has two Z-chromosomes (ZZ), while the female is heterogametic (ZW). Aves redirects here. ... // Subfamilies Dendrocygninae Oxyurinae Anatinae Merginae Duck is the common name for a number of species in the Anatidae family of birds. ...


X-linked recessive traits are expressed in all heterogametics, but only in those homogametics that are homozygous for the recessive allele. For example, an X-linked recessive allele in humans causes haemophilia. Haemophilia is much more common in males than females because males are hemizygous - they only have one copy of the gene in question - and therefore express the trait when they inherit one mutant allele. In contrast, a female must inherit two mutant alleles, a very infrequent event since the mutant allele is rare in the population. X-linked recessive is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males (who are necessarily hemizygous for the gene mutation because they have only one X chromosome) and in females who are homozygous for the... It has been suggested that this article be split into multiple articles accessible from a disambiguation page. ... This article or section does not cite its references or sources. ... It has been suggested that this article be split into multiple articles accessible from a disambiguation page. ...


The incidence of recessive X-linked phenotypes in females is the square of that in males (squaring a proportion less than one gives an outcome closer to 0 than the original). If 1 in 20 males in a human population are green color blind, then 1 in 400 females in the population are expected to be color blind (1/20*1/20). Color blindness in humans is the inability to perceive differences between some or all colors that other people can distinguish. ...

Sex-linked traits are maternally inherited from carrier mothers. Each son born to a carrier mother has a 50% probability of inheriting the X-chromosome carrying the mutant allele. X-linked Recessive inheritance From http://ghr. ...


In classical genetics, a reciprocal cross is performed to test if a trait is sex-linked. In genetics, a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern. ...

Contents

Sex-linked traits in humans

X-linked dominant

Normal vision. ... Added to User:reverie98/Desk 71. ... It has been suggested that Osteomalacia be merged into this article or section. ...

X-linked recessive

Adrenoleukodystrophy (ALD) is a degenerative disorder of myelin, a complex fatty neural tissue that insulates many nerves of the central and peripheral nervous systems. ... Androgen insensitivity syndrome (AIS, or Androgen resistance syndrome) is a set of disorders of sexual differentiation that results from mutations of the gene encoding the androgen receptor. ... Barth syndrome is a rare genetic disorder classified by many signs and symptoms, including metabolism distortion, delayed motor skills, stamina deficiency, hypotonia, chronic fatigue, delayed growth, cardiomyopathy, and compromised immune system. ... Beckers muscular dystrophy (also known as Benign pseudohypertrophic muscular dystrophy) is an X-linked recessive inherited disorder characterized by slowly progressive muscle weakness of the legs and pelvis. ... Color blindness in humans is the inability to perceive differences between some or all colors that other people can distinguish. ... Duchenne muscular dystrophy (DMD) (also known as muscular dystrophy - Duchenne type) is an inherited disorder characterized by rapidly progressive muscle weakness which starts in the legs and pelvis and later affects the whole body. ... Fragile X syndrome, also known as the Martin-Bell syndrome, is a syndrome of X-linked mental retardation. ... Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency is an X-linked recessive hereditary disease featuring nonimmune hemolytic anemia in response to a number of causes. ... This article or section does not cite its references or sources. ... Kennedy disease (KD) or X-linked spinal-bulbar muscle atrophy is a neuromuscular disease associated with mutations of the androgen receptor (AR). ... Lesch-Nyhan syndrome (LNS) is a rare, inherited disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HPRT). ... Ornithine transcarbamylase deficiency (OTC), the most common of the Urea Cycle Disorders, is a rare metabolic disorder, occurring in one out of every 40000 births. ... Wiskott-Aldrich syndrome (WAS) is a rare X-linked recessive disease characterized by eczema, thrombocytopenia (low platelet counts), immune deficiency, and bloody diarrhea (due to the low platelet counts). ... X-linked ichthyosis is an inborn error of metabolism characterized by a deficiency in microsomal sulfatase. ... Note: Centronuclear myopathy includes Myotubular myopathy, as outlined below. ... Note: Centronuclear myopathy includes Myotubular myopathy, as outlined below. ...

Y-linked

SRY (Sex-determining Region Y) is a sex-determining gene on the Y chromosome in humans and other primates. ...

Sex-linked traits in other animals


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Computer-Assisted Genetics Teaching Center (384 words)
This CD, from our distance education course, focuses only on genetic concepts and consists of four lectures on basic principles plus one supplemental lecture on coat color.
Sex linkage and other modes of inheritance for traits controlled by a single locus
Reproductive biotechnologies such as AI, MOET, sexing of semen and embryos and cloning are presented.
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        Jackson, L. A., and Ervin, K. Height stereotypes of women and men: The liabilities of shortness for both sexes.
        Jackson, L. Gender, physical attractiveness, and sex role in occupational treatment discrimination: The influence of trait and role assumptions.
        Jackson, L. The influence of sex, physical attractiveness, sex-role, and occupational sex-linkage on perceptions of occupational suitability.
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