On the planet Seltaeb, there is a rare recessive condition known
as Hofner Bassis (BB) in the Blue Meanies, a race whose genomes are
identical to that of humans. Individuals with this condition can be
clearly identified, as they are very musically gifted. The two
alleles at this locus are B (the trait allele) and b.
If both parents are known to be carriers for the recessive gene,
what is the probability that they will have an unaffected