Question

(Homologous recombination pathway) One pathway is initiated by a single strand break in each of two DNA molecules and includes the formation of a special structure called the __________________. In this model, the double stranded DNA molecules from two homologous chromosomes align precisely. A single strand break in one of the DNA molecules provides a free end that invades and joins the free end of the other DNA molecule. Thus strand invasion and joining take place on both DNA molecules, creating two heteroduplex DNAs, each consisting of one original strand plus one new strand from the other DNA molecule.

Answer 1

The special structure formed during the homologous recombination pathway is called the recombination intermediate. It involves the exact alignment and joining of two DNA molecules from homologous chromosomes. This repair process ensures accurate DNA repair without deletions and is essential for species survival and genetic diversity.

Step-by-step explanation:

The special structure formed during the homologous recombination pathway, where two double-stranded DNA molecules from homologous chromosomes align precisely and join together, is called the recombination intermediate.

In this pathway, a single-strand break in one DNA molecule invades and joins the free end of the other DNA molecule, resulting in the creation of two heteroduplex DNAs consisting of one original strand and one new strand from the other DNA.

This recombination process accurately repairs damaged DNA without any deletions, ensuring the survival and genetic diversity of species.