Question

Holliday junctions usually have a ________________ and thus are mobile, meaning that the four individual arms may slide through the junction in a specific pattern that largely preserves base pairing.

Answer 1

Holliday junctions usually have a cross-like structure and preserve base pairing during crossing over in meiosis.

Step-by-step explanation:

Holliday junctions usually have a cross-like structure and thus are mobile, meaning that the four individual arms may slide through the junction in a specific pattern that largely preserves base pairing. The mobile nature of the junction allows for the exchange of genetic information during a process called crossing over in meiosis.