Related Clues:

• It helps build character
• DNA component
• Pertaining to neap and ebb
• Tax, in Britain
• Spliced item
• Luck of the Irish
• Kelly or Rayburn
• Heredity unit
• Hereditary factor
• Formed by inflow and outflow
• Splicer's material
• It may undergo mutation
• Kind of basin
• "Star Trek" creator Roddenberry
• It's passed down