Final answer:
The Holliday model refers to homologous recombination and involves repair of single-strand breaks and repair of double-strand breaks.
Step-by-step explanation:
The Holliday model refers to homologous recombination and involves repair of single-strand breaks and repair of double-strand breaks.
Homologous recombination can repair a replication fork damaged by a single-strand break by re-establishing the fork using strands of homologous DNA. It can also repair a double-stranded DNA break using the same recombination machinery that operates on sister chromatids in meiosis.
Both processes accurately repair damaged DNA without any deletions and are conserved in the cells of all species for accurate repair and survival.