What is the level of sequence homology required for site specific recombination?

What is the level of sequence homology required for site specific recombination? Correct Answer A homologous stretch of 20-200bp

Site specific recombination takes place between regions of very short sequence homology about 20-200bp. It can occur between non-homologous chromosomes as well.

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Sequence analysis of a human gene NFI showed that a region of the protein has homology to a yeast protein called Ira. Which of the following you think is most appropriate explanation for this sequence homology?
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