Final answer:
The Zip2 protein is recruited to the early recombination nodule by a protein or structure within the synaptonemal complex, a crucial component of meiotic genetic recombination.
Step-by-step explanation:
The Zip2 protein is recruited to the early recombination nodule by a protein of a complex called the synaptonemal complex. This complex forms during the meiotic prophase and facilitates crossover between homologous chromosomes. Specifically, recombination nodules are protein assemblies that appear on the synaptonemal complex, marking the sites where crossover events are to take place. While the precise protein or structure within the synaptonemal complex that recruits Zip2 has not been detailed in the provided information, the process occurs in the context of genetic recombination, which is a crucial step in the formation of gametes with genetic variation.