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In spirogyra during the gemination of zygospore how many haploid nuclei take part

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In spirogyra during the gemination of zygospore how many haploid nuclei take part
A. One
B. Two
C. Three
D. All four
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Zygospore undergoes zygotic meiosis and forms 4 haploid nuclei of these three degenerate, So one haploid nuclei take part and one new filament is formed.
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