Answer:
indeterminate
Explanation:
The answer would be an indeterminate number of generations.
The blue trait is a heterozygous trait. In other words, the blue allele does not really exist. Two different alleles team up to produce the trait, whereas, only two the same allelic conditions can produce a true-breeding flock.
Hence, it will take an indeterminate number of generations to produce a true-breeding flock of the Blue Andalusions.