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The fawn mutation within the Shafttail Finches is
a common mutation. It is believed that the fawn variety is a
color mutation qualitatively changing the appearance of
eumelanin pigment from black to dark brown as a result of
its incomplete oxidation.
The
inheritance of the fawn mutation is recessively sex-linked.
This means that a fawn mutant from two normally
colored parents will always be a female. Fawn males are rare
because they can only be born from a fawn mother and a normal
father that has been split to this mutation, and of course,
from parents that are both the fawns. |
