Correct answer:

(1) A long cystic duct travelling alongside the common hepatic duct to open near the duodenal orifice. (2) Congenital absence of the gallbladder.
(3) Congenital obliteration of the ducts (biliary atresia, one of the causes of neonatal jaundice).
(4) Absence of the cystic duct, the gallbladder opening directly onto the side of the common bile duct.
(5) A long mesentery to the gallbladder, which allows acute torsion of the gallbladder to occur with consequent gangrene and rupture.
(6) Anomalies of the arrangement of the blood vessels supplying the gallbladder are common.
(7) Cystic dilatation of the main bile ducts (choledochal cyst). (8) Congenital duplication of the gallbladder.