Question

what is the result of the process of crossing-over during prophase i?
the homologous pair of chromosomes comes together, and no sections of the chromosomes are exchanged.
the replicated homologous pair of chromosomes comes together, and the whole chromosome is exchanged.
the replicated homologous pair of chromosomes comes together, and sections of the chromosomes are exchanged.
the homologous pair of chromosomes separate into identical pairs.

Explanation:

Crossing-over in prophase I occurs when replicated homologous chromosomes (tetrads) pair up, and non-sister chromatids exchange corresponding sections of DNA. This process increases genetic diversity.

Answer:

The replicated homologous pair of chromosomes comes together, and sections of the chromosomes are exchanged.