Given the number of 'unusual' boas in this litter, and the ratio being close to the 1.2.1 (homozygous dominant:heterozygous:homozygous recessive) expected for a recessive trait, it seems clear that this is indeed a recessive trait. If the 'prodigy' boa had of been represented as a single animal in this litter then the question would arise that this was a new mutation. As a result it is highly likely that this is indeed a recessive trait. I agree that breeding trials are needed to confirm, but it is unlikely to be anything else.

Regards,
Warren
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Dr Warren Booth
North Carolina State University
Department of Entomology
3309 Gardner Hall
Raleigh, NC 27695-7613

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