The great white shark is notable for its size, with mature female individuals growing up to 6.1 m (20 ft) in length and 1,950 kg (4,300 lb) in weight. However most are smaller, males measuring 3.35 to 3.96 m (11 ft 0 in to 13 ft 0 in) and females 4.57 to 4.88 m (15 ft 0 in to 16 ft 0 in) on average.
For most ALS genes, only one mutated copy is needed to cause disease. This is called a âdominantâ gene. For other genes, both copies must be mutated to cause disease. This is called a ârecessiveâ gene. During formation of eggs and sperm, gene pairs split up, so that an egg (or sperm) contains only one gene copy.
There are three types of ALS: familial, sporadic and Guamanian. Familial is inherited genetically and is the least common form, occurring in only about 5-10% of cases. Researchers are still uncertain as to what causes sporadic and Guamanian ALS. There are several common conditions that accompany the illness and these are theorized to be related to the of developing the disease. Some of the most common causes of ALS may include: Heavy metal toxicity.