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- Sex_linkage abstract "Sex linkage is the phenotypic expression of an allele related to the chromosomal sex of the individual. This mode of inheritance is in contrast to the inheritance of traits on autosomal chromosomes, where both sexes have the same probability of inheritance. Since humans have many more genes on the X than the Y, there are many more X-linked traits than Y-linked traits.In mammals, the female is the homogametic sex, with two X chromosomes (XX), while the male is heterogametic, with one X and one Y chromosome (XY). Genes on the X or Y chromosome are called sex-linked.In birds, the opposite is true: the male is the homogametic sex, having two Z chromosomes (ZZ), and the female (hen) is heterogametic, having one Z and one W chromosome (ZW).X-linked recessive traits are expressed in all heterogametics, but are only expressed in those homogametics that are homozygous for the recessive allele. For example, an X-linked recessive allele in humans causes hemophilia. Hemophilia 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 less frequent event since the mutant allele is rare in the population. Tsarevich Alexei of Russia was the most famous sufferer of X-linked hemophilia.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 red-green color blind, then 1 in 400 females in the population are expected to be color-blind (1/20)*(1/20). (The term 'color-blind' is not completely accurate. There are degrees of weakness in color vision and it is now called 'color vision deficiency')X-linked traits are maternally inherited from carrier mothers or from an affected father. Each son born to a carrier mother has a 50% probability of inheriting the X-chromosome carrying the mutant allele. There are a few Y-linked traits; these are inherited from father.In classical genetics, a reciprocal cross is performed to test if a trait is sex-linked.".
- Sex_linkage thumbnail Sex-linked_inheritance.svg?width=300.
- Sex_linkage wikiPageID "1420406".
- Sex_linkage wikiPageRevisionID "601712859".
- Sex_linkage hasPhotoCollection Sex_linkage.
- Sex_linkage subject Category:Genetics.
- Sex_linkage subject Category:Plant_sexuality.
- Sex_linkage comment "Sex linkage is the phenotypic expression of an allele related to the chromosomal sex of the individual. This mode of inheritance is in contrast to the inheritance of traits on autosomal chromosomes, where both sexes have the same probability of inheritance.".
- Sex_linkage label "Caratteri legati al sesso".
- Sex_linkage label "Herança ligada ao sexo".
- Sex_linkage label "Sex linkage".
- Sex_linkage label "Transmission dominante liée à l’X".
- Sex_linkage label "Наследование, сцепленное с полом".
- Sex_linkage label "伴性遗传".
- Sex_linkage label "伴性遺伝".
- Sex_linkage sameAs Dědičnost_znaků_a_pohlaví.
- Sex_linkage sameAs Φυλοσύνδετη_κληρονομικότητα.
- Sex_linkage sameAs Sexuari_loturiko_herentzia.
- Sex_linkage sameAs Transmission_dominante_liée_à_l’X.
- Sex_linkage sameAs Caratteri_legati_al_sesso.
- Sex_linkage sameAs 伴性遺伝.
- Sex_linkage sameAs 반성_유전.
- Sex_linkage sameAs Herança_ligada_ao_sexo.
- Sex_linkage sameAs m.0502mk.
- Sex_linkage sameAs Q1142188.
- Sex_linkage sameAs Q1142188.
- Sex_linkage wasDerivedFrom Sex_linkage?oldid=601712859.
- Sex_linkage depiction Sex-linked_inheritance.svg.
- Sex_linkage isPrimaryTopicOf Sex_linkage.