What you need to know about your health
Although there are many possible causes of illness and disease, family history and genetics are often one of the strongest contributing factors. People obviously inherit their chromosomes from their parents, but genetic disorders can appear for many reasons. Genetic disorders are grouped by how their patterns occur in families and can be dominant or recessive, depending on how they cause conditions and appear within families.
Dominant:
Dominant diseases often appear in every generation of a family. This happens because a person needs only one altered copy of a gene to develop the condition. When a dominant mutation is present, the individual carrying it will typically show symptoms, making the pattern easier to trace through a family’s history.
These conditions arise when a single gene undergoes a DNA change that disrupts its normal function. If one parent carries this mutated gene, each child faces a 50 percent chance of inheriting it. This probability remains the same for every pregnancy. The presence of the mutated gene does not always determine how severe the symptoms will be. People within the same family may experience the disease differently due to factors like environment, lifestyle, and additional genetic influences. Understanding how dominant inheritance works helps families recognize risks earlier and encourages proactive conversations with healthcare providers about testing, monitoring, and potential treatment options.
Recessive:
Recessive diseases work differently from dominant ones because a person must inherit two mutated copies of the same gene, one from each parent, to develop the condition. When both parents carry a single mutated gene but do not show any symptoms, they are considered carriers. In this situation, each child has a 25 percent chance of inheriting both mutated copies and developing the disease. There is also a 50 percent chance the child will become a carrier like the parents and a 25 percent chance of inheriting two unaffected copies.
These conditions are harder to identify in family histories because carriers look and feel completely healthy. Without symptoms to signal a problem, the mutation can be passed silently through several generations. Families may not realize a recessive disease is present until a child is born with the condition. Genetic counseling and testing can help uncover carrier status and provide clearer insight into potential risks. Understanding how recessive inheritance works empowers families to make informed decisions about planning, screening, and early intervention when necessary.
Single Gene Disorders:
Single-gene disorders are caused by DNA changes in one gene and often have predictable inheritance patterns. Individually, single-gene disorders are very rare, but they affect about one percent of the population.
Aspects of health influenced by genetics
There are likely to be genes whose variability controls how much or how little a person is likely to be responsive to the environmental risk factors that are associated with disease risk. Plus, there are genes that affect a person’s overall longevity that may counteract or interact with genes that may have an additional impact.
Diseases that are single-gene inheritance disorders include cystic fibrosis, sickle cell anemia, and Huntington’s disease. Diseases that are linked to genetic disorders are heart disease, high blood pressure, Alzheimer’s disease, arthritis, diabetes, cancer, and obesity.
At Foothills Neurology, we understand that seeing a neurologist can make some people feel anxious, but our staff and providers are dedicated to putting you at ease throughout the entire process. Your medical history and family history are important factors that contribute to providing you with the care you need.