Question

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

Explanation:

• Conjugation: Refers to a form of genetic transfer in bacteria, not related to chromosome arm intersection.
• Fusion zone: Not a standard term for this chromosomal structure.
• Synapse: In genetics, during meiosis, homologous chromosomes pair up. The physical point where the arms of chromosomes intersect (chiasmata form here later, related to crossing - over) is part of the synapsis process.
• Tetrad: Refers to a group of four chromatids (two homologous chromosomes each with two sister chromatids) but not the specific intersection point term.

Answer:

synapse