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.
The NCO insignia evolved through the years from a variety of shapes, styles, and colors to the chevrons worn today. Sometimes changes in uniform style and colors dictated changes in the style and color of the chevrons. The history of the insignia is complex and often confusing. In some cases, no official records survived to document the use of certain insignia.