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.
Mendel's meticulous study produced astonishing results: Not only did the monk discover the idea of dominant and recessive traits, he was able to apply a consistent mathematical formula that explained the frequency with which each trait appeared. 1  His discoveries would be summarized into some basic principles: 1  That each inherited trait is determined by units (what we'd later call a gene) passed on independently of other traits. 2  That each trait is made up of two units, one received from each parent.