Question 2 of 21

If both parents pass along a particular defective gene, their child will develop cystic fibrosis.

... A person will develop cystic fibrosis if both of his or her parents pass along copies of a defective gene.

Question 3 of 21

Most cases of Huntington's disease develop before adulthood.

... While some cases of Huntington's disease develop before adulthood, most cases appear in a patient's 30s or 40s.

Question 4 of 21

Life expectancy for cystic fibrosis sufferers has not changed since the disease was first described.

... Whereas it was once rare for cystic fibrosis sufferers to live into their early 20s, sufferers may now live 40 years or more.

Question 5 of 21

People with Huntington's disease are sterile.

... Huntington's disease is believed to have no effect on fertility.

Question 6 of 21

Children of people with Huntington's disease have a 50 percent chance of inheriting the defective gene.

... It's true that children of people with Huntington's disease have a 50 percent chance of inheriting the defective gene.

Question 7 of 21

Hemophilia is a group of blood-clotting disorders.

... Hemophilia is a family of blood-clotting disorders, not just the name of one disorder.

Question 8 of 21

The blood of a hemophiliac has difficulty clotting, leading to excessive bleeding.

... Hemophiliacs may suffer from excessive bleeding, due to the fact that their blood fails to clot properly.

Question 9 of 21

von Willebrand disorder is more severe than hemophilia.

... von Willebrand disorder is actually less severe than hemophilia.

Question 10 of 21

Sickle cell disease is so named because the mutated gene responsible is shaped like a sickle.

... Sickle cell disease, also known as sickle cell anemia, gets its name from the fact that patients have sickle-shaped red blood cells.

Question 11 of 21

Schwannomatosis is the most common type of neurofibromatosis.

... Schwannomatosis is actually the least common type of neurofibromatosis.

Question 12 of 21

Neurofibromatosis is a group of genetic disorders characterized by the growth of tumors throughout the nervous system.

... Neurofibromatosis is a group of genetic disorders that cause tumors to develop throughout the nervous system.

Question 13 of 21

Neurofibromatosis is not usually fatal.

... Neurofibromatosis is not fatal in most cases.

Question 14 of 21

Tay-Sachs is always fatal.

... Most children born with Tay-Sachs disease die by age 4 or 5. Tay-Sachs is generally considered to be fatal in all cases.

Question 15 of 21

Angelman syndrome was first described by Dr. Leonard Angelman in 1964.

... Angelman syndrome was first described by Dr. Harry Angelman in 1965.

Question 16 of 21

Tay-Sachs can't be diagnosed in utero.

... Tay-Sachs can be diagnosed in utero.

Question 17 of 21

People with Angelman syndrome have difficulty with speech.

... People with Angelman syndrome have difficulty with speech, though they can often learn to communicate with a mixture of verbal and nonverbal speech, including sign language.

Question 18 of 21

The cysts associated with PKD are cancerous.

... The cysts associated with PKD are noncancerous.

Question 19 of 21

The fatality rate of Canavan's disease is high.

... The fatality rate of Canavan's disease is very high -- most children die as toddlers.

Question 20 of 21

Muscular dystrophy encompasses a range of almost identical muscular disorders.

... Muscular dystrophy encompasses a range of muscular disorders that share many similarities but also vary in severity and time of onset.

Question 21 of 21

PKD causes kidneys to shrink.

... The cysts associated with PKD can add significantly to the weight of kidneys, causing just one to eventually weigh 20 pounds (9.1 kilograms) or more.

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