How does the alignment of chromosomes during prophase I facilitate the crossing

Question

How does the alignment of chromosomes during prophase I facilitate the crossing over of chromosomal material?

a The homologous chromosomes cross over at recombination nodules, where the chromatids physically overlap.

b The chiasmata holds the homologous chromosomes closely together at specific points along their lengths.

c The synaptonemal complex forms bridges between the paired homologous chromosomes at points where crossing over occurs.

d The homologous chromosomes are tightly paired along their entire lengths, forming a synapsis.

Explanation / Answer

The answer is a The homologous chromosomes cross over at recombination nodules, where the chromatids physically overlap.

During prophase I of meiosis, the homologous chromsomes pairsup and the recombination occurs between non sister chromatids.The Chaismata is the physical evidence of crossing over or recombination.

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