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Sex-linked


sex-linked traits
those traits whose genes are located on the sex chromosome
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Some genes are present only as one set (sex-linked).
Facts
Mendel's experiments resulted in the idea that organisms were diploid, having two sets of all genes.
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Located on the X chromosome. Sex-linked (or x-linked) diseases are generally seen only in males.
explained:
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sex-linked genes
Genes located on one sex chromosome but not the other.
sex-linked trait ...
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Sex-linked Traits or diseases associated with the X or Y chromosome; generally seen in males.
See also: gene, mutation, sex chromosome ...
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Sex-linked: A trait transmitted by one of the chromosomes determining sex of an individual.
Short arm (p): One of the two prominent segments of a chromosome; the long or "q" arm is the other. The arms of a given chromosome join at its centromere.
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Identify sex-linked, co- dominant, incomplete dominant, multiple allele, polygenic traits
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Analyze sample pedigrees; determine type of inheritance ...
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hemophilia A human sex-linked recessive genetic disorder that results in the absence of certain blood-clotting factors, usually Factor VII. Hemophiliacs suffer from an inability to clot their blood.
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Where the a gene is sex-linked, the heterogametic sex (e.g. males in humans) have only one copy of the gene and are effectively haploid for that gene.
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Where the A gene is sex-linked, the heterogametic sex (e.g., human males) have only one copy of the gene (and are termed hemizygous), while the homogametic sex (e.g., human females) have two copies. The genotype frequencies at equilibrium are
p
and ...
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Hemophilia -- a sex-linked disease in humans in which the blood-clotting process is defective. Heterogeneity -- the production of identical or similar phenotypes by different genetic mechanisms. HGP -- Human Genome Project.
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Genes inherited in this fashion are described as sex-linked or, more precisely, X-linked.
X-Linkage: An Example ...
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