Question

Meiosis results in genetic variation among its product cells. One source of this genetic variation is the random distribution of maternal and paternal chromosomes, and the other source of genetic variation is crossing over occurring at prophase I O the arrival of chromosomes at the spindle poles in telophase I O the division of the cytoplasm at cytokinesis O chromosomes condensing at prophase II O the reforming of the nuclear envelope at interkinesis

Answer 1

Note: Question is not clearly written i have added the full question as picture attachment.

Answer:

Option a) crossing over occurring at prophase I

Explanation:

Crossing over is a process in which two homologous chromosome's chromatids paire with each other and exchange the segments. This results in recombination of two chromatids and genetic variations. This process actually occur in Prophase I. I have attached a picture explaining the process.