Difference between x linked and sex linked

NCBI Bookshelf. It is important to understand the basic laws of inheritance to appreciate how conditions are passed on in a family. An accurate family health history is a valuable tool to illustrate how conditions are passed down through generations. A person has two copies of almost every gene, one copy from mom and one copy from dad. Scientists have studied human genes to learn how they normally work and how changes in genes can change how they work. Some changes are very minor and do not affect the way a gene works.
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X-linked inheritance

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Inheritance of Single-Gene Disorders - Fundamentals - Merck Manuals Consumer Version

Sex Linked Genes. A particularly important category of genetic linkage has to do with the X and Y sex chromosomes. These not only carry the genes that determine male and female traits but also those for some other characteristics as well. Genes that are carried by either sex chromosome are said to be sex linked. Men normally have an X and a Y combination of sex chromosomes, while women have two X's.
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Inheritance of Single-Gene Disorders

Sex linked is a trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X chromosome. This is because the X chromosome is large and contains many more genes than the smaller Y chromosome.
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NCBI Bookshelf. An Introduction to Genetic Analysis. New York: W. Freeman; Most animals and many plants show sexual dimorphism ; in other words, an individual can be either male or female.
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