= Solution
The <recombination fraction> is the <probability> that a transmitted gamete is recombinant between the two loci in the ordinary two-locus <genetic linkage> model. Its conventional range is
$$
\boxed{0\leq\theta\leq\tfrac12.}
$$
Zero corresponds to complete linkage and $1/2$ to independent assortment. Multiple physical crossovers can restore parental phase, so the recombination fraction is not the expected number of crossovers or an unrestricted crossover <probability>.
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