Final answer:
Strand invasion generates new leading strand replication, while branch migration refers to the movement of the point of invasion along the DNA molecule.
Step-by-step explanation:
Strand invasion generates new leading strand replication on an unbroken homolog template. This process involves the invasion of a single-stranded DNA molecule into a double-stranded DNA molecule, allowing for the initiation of DNA replication.
Branch migration, on the other hand, refers to the movement of the point of strand invasion along the DNA molecule. This process occurs during homologous recombination and helps to resolve DNA structures, allowing for the exchange of genetic material between homologous chromosomes.