Sex linked dominance

Some genetic conditions are caused by mutations in a single gene. These conditions are usually inherited in one of several patterns, depending on the gene involved:. Many health conditions are caused by the combined effects of multiple genes described as polygenic or by interactions between genes and the environment. Such disorders usually do not follow the patterns of inheritance listed above. For more information, please see What are complex or multifactorial disorders? Disorders caused by changes in the number or structure of chromosomes also do not follow the straightforward patterns of inheritance listed above.

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.

Sex-linked dominant is a rare way that a trait or disorder can be passed down through families. One abnormal gene on the X chromosome can cause a sex-linked dominant disease. Inheritance of a specific disease, condition, or trait depends on the type of chromosome that is affected. It can be either an autosomal chromosome or a sex chromosome. It also depends on whether the trait is dominant or recessive.

One abnormal gene on the X chromosome can cause a sex-linked dominant disease. Inheritance - sex-linked dominant; Genetics - sex-linked dominant; X-linked dominant; Y-linked dominant. Inheritance of a specific disease, condition, or trait depends on the type of chromosome that is affected.