Final answer:
In eukaryotes, RecA homologs are Rad51 and Dmc1, both of which are involved in DNA repair through homologous recombination, with Rad51 functioning in both mitotic and meiotic events, and Dmc1 being meiosis-specific. The correct answer is option 3) Rad50 and Spo11
Step-by-step explanation:
In eukaryotes, the proteins that are homologs of RecA, a protein involved in DNA repair and homologous recombination in bacteria, are Rad51 and Dmc1. Rad51 is a protein that plays a crucial role in the search for homology and strand pairing stages of the process, participating in both mitotic and meiotic recombination, and is highly similar to RecA. It forms a nucleoprotein filament that is involved in the repair of double-strand breaks in DNA by homologous recombination.
Another protein, Dmc1, is specific to meiosis, where it aids in synapsis, the pairing of homologous chromosomes. Therefore, the correct answer to which of the following proteins are homologs of RecA is Dmc1 and Rad51.