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For a lethal guinea pig to be born, a Roan to Roan, Dalmatian to Roan or Dalmatian to Dalmatian mating will have happened. As each Roan or Dalmatian guinea pig carries two genes each (as explained in the section above), each guinea pig that is born from their mating will have a 1 in 4, or 25% chance, of being born a Lethal. The other babies have a 50% of CARRYING the Roan or Dalmatian gene, or a 25% of NOT having the Roan or Dalmatian gene at all.
Lethal guinea pigs occur out of parents that both carry either the Roan or the Dalmatian gene.

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