Tay-Sachs disease is caused by a defective gene on chromosome 15. When both parents carry the defective Tay-Sachs gene, a child has a 25% chance of developing the disease. The child must receive two copies of the defective gene -- one from each parent -- in order to become sick.
Enacted by law in 2013, the newest symbols of North Carolina are the state art medium, clay; the state fossil, the Megalodon teeth; the state frog, the Pine Barrens tree frog; the state marsupial, the Virginia opossum; and the state salamander, the Marbled salamander.
Here are some fun North Carolina facts: The state capital is Raleigh. The largest city is Charlotte. State motto is âTo Be Rather than to Seemâ. State nickname is the Tar Heel State. State flower is the Flowering Dogwood. State bird is the Cardinal. State animal is the Gray Squirrel.