Related Clues:

• See 22-Across
• Shepherd's pie ingredients
• Narrow margins
• Petitions
• Some are split
• Blowgun ammo
• See 23-Across
• Subjects of Mendelian experiments
• They may be strained in young families
• Black-eyed ___
• Potpie ingredients
• They may be split
• Bristles
• Some forensic evidence
• Exemplars of twinship