Allele-like versus homeologous relationship between genes in more than two copies.

<p>(A) An example of homoeologous relationship where each <i>M</i>. <i>arenaria</i> gene copy (arrows) clusters with the copy of another species. (B) An example of allele-like relationship where two of the three <i>M</i>. <i>incognita</i> gene copies (arrows) are more similar to one another than they are to a copy from another species.