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In pachytene stage of meiosis the chromo...

In pachytene stage of meiosis the chromosomes appear

A

single stranded

B

three stranded

C

double stranded

D

four stranded

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**Step-by-Step Solution:** 1. **Understanding the Pachytene Stage**: The pachytene stage is a specific phase in meiosis, which is the process of cell division that reduces the chromosome number by half. It occurs after the zygotene stage and is characterized by the pairing of homologous chromosomes. 2. **Formation of Recombination Modules**: During the pachytene stage, homologous chromosomes undergo a process called recombination. This is where genetic material is exchanged between the paired chromosomes, leading to genetic diversity. 3. **Homologous Chromosomes and Bivalents**: In this stage, each pair of homologous chromosomes is referred to as a bivalent. Each bivalent consists of two homologous chromosomes, and each of these chromosomes has two sister chromatids. 4. **Counting the Chromatids**: Since each homologous chromosome has two sister chromatids, when two homologous chromosomes come together, there are a total of four chromatids. Thus, the structure formed during this stage is often referred to as a tetrad. 5. **Conclusion**: Therefore, in the pachytene stage of meiosis, the chromosomes appear in a four-stranded form, which is also known as a tetrad of chromatids. **Final Answer**: In the pachytene stage of meiosis, the chromosomes appear in a four-stranded form (tetrad). ---
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