Doctor insights on:
How Is Marfan Inherited
From both parents: CF is an autosomal recessive disorder meaning the infant must inherit a mutated or abnormal copy of the CF gene from both the mother and the father. If both parents are carriers of a CF mutation, the odds of the infant having CF are 1 out of 4 or 25% for every pregnancy. ...Read moreSee 1 more doctor answer
Hemo."A" is X-linked: Hemophilia "a" is a hereditary bleeding disorder where there is a deficiency in clotting factor viii (factor viii is needed for blood clotting). It is inherited on the x-chromosome (sex-linked). Men only have 1 "x", so if their "x" is mutated, they will have the disease. Women have 2 "x's", so they can have 1 mutated "x" and 1 normal "x", and be a carrier of the disease, with mild or no symptoms. ...Read moreSee 1 more doctor answer
Multifactorial: Although clearly a genetic disorder, the mode of inheritence for tourette's is complex, involving multiple defective genes, and perhaps even an interplay of genetic and environmental factors. There is also clearly a genetic association between the triad of tourette's, ocd, and adhd, and i generally screen patients i diagnose with tourette's for concurrent adhd and/or ocd. ...Read moreSee 2 more doctor answers
Intelligence, like : Everything else we have, is from genetics + environment. Long ago, i heard the famous geneticist, dave smith, say it was more linked to maternal than paternal iq. Truth is, we get equal #'s of genes from mom & dad. Children of moms who didn't graduate from hs have 7x the risk of the gen'l population for intellectual disability, maybe because moms still impact a child's environment more than dads. ...Read moreSee 1 more doctor answer
From Mom and/or Dad: Alpha thalassemia is caused by a mutation in one or more of the 4 genes that code for (holds the dna for) Alpha globulin, which is needed to make hemoglobin for new red blood cells. Beta thalassemia is caused by a mutation in one or both of the 2 beta globulin genes. Mom and/or dad can carry the mutations. A child can inherit a mutation from mom, from dad, or from both mom and dad. ...Read moreSee 1 more doctor answer
It isn't: This syndrome results when an egg with a pair of chromosome 13 (instead of 1) joins with the male's 13 at conception leading to a distortion of the information in each cell of the body.Multiple birth defects are common and these kids do not live very long. It is not inherited on the genes. ...Read more
Not sure: While there is a lot of evidence that schizophrenia runs in families, the specific genes have been hard to figure out. It seems that the genetics are complicated because there is also a strong effect from environmental stressors like exposures by fetuses to certain viruses. There is also a newer idea called epigenetics in which the environment affects these genes that are related to schizophrenia. ...Read moreSee 1 more doctor answer
Non-disjunction.: The majority of cases of the lethal patau or trisomy 13 syndrome are caused by nondisjunction (47, +13) related to advanced maternal age. Robertsonian translocations of either parent can increase the risk for that couple, although most affected embryos die in utero. ...Read moreSee 1 more doctor answer
Gene for Factor VIII: Hemophilia a is a hereditary bleeding disorder where there is a deficiency in clotting factor viii (factor viii is needed for blood clotting). It is inherited on the x-chromosome (sex-linked). Men only have 1 "x", so if their "x" is mutated, they will have the disease. Women have 2 "x's", so they can have 1 mutated "x" and 1 normal "x", and be a carrier of the disease, with mild or no symptoms. ...Read more
Galactosemia genetic: Galactosemia is a disease that affects how body processes a sugar called galactose which is present e.g. In dairy. It is an autosomal recessive condition which means that each parent is a carrier of a nonfunctional copy of a gene. Because their other copy of that gene is functional they don't have symptoms. If both parents pass on the nonfunctional copy to a child, the child will have galactosemia. ...Read more
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