Final answer:
The process occurring from prophase I to anaphase I in which chromatids attach at crossing-over sites is part of option 2,meiosis, specifically meiosis I.
Step-by-step explanation:
The process that starts in prophase I and ends in anaphase I, where chromatids temporarily attach at crossing-over sites, is a part of meiosis. During prophase I, homologous chromosomes pair up and exchange segments in a process called crossing-over, which increases genetic diversity. This is unique to meiosis and does not occur in mitosis. The paired chromosomes then line up during metaphase I and are pulled apart during anaphase I when spindle fibers shorten and the homologous chromosomes separate, moving toward opposite poles of the cell.
The process that starts in prophase I and ends in Anaphase I, where chromatids temporarily attach at crossing over sites, is called Meiosis. In prophase I of meiosis, homologous chromosomes pair up and undergo crossing over, where segments of chromosomes are exchanged. Then, during Anaphase I, the homologous chromosomes separate and move toward opposite poles of the cell.