Pain that occurs with a fever, nausea, and vomiting or loss of appetite may be a sign of inflammation or infection of the gallbladder (acute cholecystitis). Symptoms that may mean that a gallstone is blocking the common bile duct include: 1  Yellowing of the skin and the white part of the eyes (jaundice).  Dark urine.
Mendel concluded that biological inheritance is determined by factors that are passed from one generation to the next. Mendel also concluded that the principle of dominance states that some alleles are dominant and others are recessive.
Biological factors that are thought to shape gender differences include hormones and lateralization of brain function. Hormones may organize a biological predisposition to be masculine or feminine during the prenatal period, and the increase in hormones during puberty may activate that predisposition.