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Duchenne muscular dystrophy is inherited in an X-linked recessive pattern, just like hemophilia is. Symptoms of DMD include frequent falls, trouble getting up or running, waddling gait, big calves, and learning disabilities.

This is a pedigree of how Duchenne muscular dystrophy is passed down.

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MedlinePlus Genetics provides information about the effects of genetic variation on human health. Learn about genetic conditions, genes, chromosomes, and more.

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Every person inherits two CFTR genes. Each one from a parent. Children who inherit a faulty CFTR gene from each parent will have Cystic Fibrosis. Symptoms vary and can include cough, repeated lung infections, inability to gain weight, and fatty stools.

This is a pedigree of how Cystic Fibrosis is passed down. As shown, the cystic fibrosis gene is recessive

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Tay Sachs is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. Symptoms of slowed development usually appear around six months of age. Symptoms progress until they lead to death, often around age four.

This is a pedigree of how Tay Sachs is passed down.

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Hemophilia is inherited in an x-linked recessive pattern. This means that the recessive gene is located on the X chromosome. Symptoms of hemophilia include large or deep bruises, joint pain and swelling, unexplained bleeding, and blood in urine or stool. Also, the blood does NOT clot.

This is a pedigree of how hemophilia is passed down.

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PKU is inherited in families in an autosomal recessive pattern, which means that a person needs two copies of this gene to be affected. This very rare disease can lead to brain damage, intellectual disabilities, behavioral symptoms, or seizures, especially if not treated.

This is a pedigree of how PKU (Phenylketonuria) is passed down.

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Sickle Cell is inherited in an autosomal recessive pattern, just like Tay Sachs. The most common symptoms of sickle cell anemia are infections, pain, and fatigue.

This is a pedigree of how Sickle Cell Anemia is passed down

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Huntington's disease is inherited in an autosomal dominant fashion. That means that the probability of each offspring inheriting an affected gene is 50%. Huntington's disease results in progressive movement, thinking, and psychiatric symptoms. For example, amnesia and lack of restraint are common symptoms.

This is a pedigree of how huntington's is passed down.