Question

what is the physical point where the arms of chromosomes intersect, preceding crossing over, called?
fusion zone
conjugation
tetrad
synapse

Explanation:

• Fusion zone: Not a standard term in this context.
• Conjugation: Refers to a form of genetic transfer in bacteria, not related to chromosome arm intersection.
• Tetrad: A group of four chromatids (two pairs of sister chromatids) formed during meiosis. The physical point where chromosome arms intersect (chiasmata) occurs within a tetrad before crossing - over.
• Synapse: Refers to the junction between two neurons, not relevant to chromosome structure.

Answer:

tetrad