Content deleted Content added
No edit summary |
|||
Line 5:
'''X-linked dominant inheritance''', sometimes referred to as '''X-linked dominance''', is a mode of [[Genetics|genetic]] [[Heredity|inheritance]] by which a [[dominant gene]] is carried on the [[X chromosome]]. As an inheritance pattern, it is less common than the [[X-linked recessive inheritance|X-linked recessive]] type. In medicine, X-linked dominant inheritance indicates that a gene responsible for a [[genetic disorder]] is located on the X chromosome, and only one copy of the [[allele]] is sufficient to cause the disorder when inherited from a parent who has the disorder. In this case, someone who [[Gene expression|expresses]] an X-linked dominant allele will exhibit the disorder and be considered affected.
X-linked dominant traits do not necessarily affect males more than females (unlike [[X-linked recessive]] traits). The exact pattern of inheritance varies, depending on whether the father or the mother has the trait of interest. All fathers that are affected by an X-linked dominant disorder will have affected daughters but not affected sons. However, if the mother is also affected then sons will have a chance of being affected, depending on whether a dominant or recessive X chromosome is passed on. When the son is affected, the mother will always be affected. Some X-linked dominant conditions are embryonic lethal in males, making them appear to only occur in
==Genetics==
| |||