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• The study found that a single genetic mutation in these tigers caused black stripes to broaden or spread into the tawny background.
  
  
• Tigers have a distinctive dark stripe pattern on a light background of white or golden.
  
  
• A rare pattern variant, distinguished by stripes that are broadened and fused together, is also observed in both wild and captive populations.
  
  
• This is known as pseudo-melanism, which is different from true melanism, a condition characterised by unusually high deposition of melanin, a dark pigment.
  
  
• While truly melanistic tigers are yet to be recorded, pseudo-melanistic ones have been camera-trapped repeatedly, and only, in Simlipal, a 2,750-km tiger reserve in Odisha, since 2007.
  
  
• Through whole-genome data and pedigree-based association analyses from zoo tigers, the study found that pseudo-melanism is linked to a single mutation in Transmembrane Aminopeptidase Q (Taqpep), a gene responsible for similar traits in other cat species.