Final answer:
The correct answer is D. None of the above. A tetrad is formed during the process of meiosis when homologous chromosomes pair up. Option A and B represent two sets of chromosomes, not tetrads. Option C represents one set of homologous chromosomes, not a tetrad.
Step-by-step explanation:
The correct answer is D. None of the above. A tetrad is formed during the process of meiosis when homologous chromosomes pair up. In this study, it is mentioned that homologous chromosomes form the tetrads during prophase I of meiosis. Option A and B represent two sets of chromosomes, not tetrads. Option C represents one set of homologous chromosomes, not a tetrad.
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