leucistic Crimson Rosella

To: Sue Lashko <>, canberrabirds chatline <>
Subject: leucistic Crimson Rosella
From: Ryu Callaway <>
Date: Sun, 5 Nov 2017 11:45:04 +0000
And a similar bird reported to Canberra Nature Map in September from Banks

The following site ( lists the 'blue' Crimson Rosella which looks like these birds as a recessive mutation. 
My simplistic interpretation of that I think is:
  • A bird may carry the mutated gene but not show it
  • For a Crimson to be 'blue' both its parents must carry the mutant gene
  • The 'blue' Rosella must receive the mutant gene from both parents
  • 2 normal parents both carrying the recessive gene: 25% chance of 'blue' offspring
  • 1 blue rosella and the other normal parent carrying the recessive gene: 50% chance of 'blue' offspring
  • 2 blue rosellas: 100% chance of 'blue' offspring

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