Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

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Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

BlackTom AI · Accepted Answer

The question asks about the stage of the cell cycle when crossing over occurs, and provides two answer choices: 'prophase' and an empty option.
First, consider what crossing over is: it is the exchange of genetic material between homologous chromosomes that occurs during meiosis, not mitosis.
Option 1: 'prophase' — This is the correct stage to associate with crossing over, specifically during prophase I of meiosis when homologous chromosomes pair up (synapsis) and form the synaptonemal complex, leading to recombination events.
Option 2: '' (empty) — This option is not a valid stage of meiosis; it provides no information and cannot be considered correct because it fails to identify a real phase where crossing over happens.
In more detail, the key concept is that crossing over occurs during prophase I, particularly during the sub-stages of leptotene, zygotene, pachytene, diplotene, and diakinesis, with recombination initiating in leptotene and completing in pachytene before homologs move to metaphase I. Any answer that suggests mitotic phases (like metaphase, anaphase, or cytokinesis) would be incorrect, since crossing over is a meiotic event.
Thus, option 1 correctly identifies the stage associated with the phenomenon, while option 2 fails to provide a valid stage and thus is incorrect.

Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

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Question at position 5 Crossing over occurs in Printed Blank[input]Question Blank 1 of 1[input] 1.anaphasecytokinesistelophaseinterphasemetaphaseprophase

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