Stalking.] [AS. staelcan, stealcian to go slowly; cf. stealc high, elevated, Dan. stalke to stalk; probably akin to 1st stalk.] 1. To walk slowly and cautiously; to walk in a stealthy, noiseless manner; -- sometimes used with a reflexive pronoun. --Shak.
In the case of hemochromatosis, it is believed that a single individual in Europe, 60 to 70 generations ago, was the sole origin of most of the hemochromatosis seen in the world today.
Main article: Endosymbiotic theory. The endosymbiosis theory explains the origins of organelles such as mitochondria and chloroplasts in eukaryotic cells. The theory proposes that chloroplasts and mitochondria evolved from certain types of bacteria that eukaryotic cells engulfed through endophagocytosis.