Yep, same kind of situation. We see it in some boa, retic and burm morphs as well
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Incorrect.
Amel is shorthand for amelanistic. a- is a prefix of negation from the Greek usage a- or an- for “not” and melanistic is a derivative on melanin that comes from the Greek term melanos, meaning “dark,” Thus, literally translated as “not dark”, or, more properly, not carrying the dark pigment melanin.
Tyrosinase is not a pigment, it is an enzyme that processes tyrosine. The processing of tyrosine is a necessary critical step in the production of melanin. When tyrosinase is absent, this critical step cannot occur and so the pigment is not produced.