Which one of the following is diploid?

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(B) In the process of spermatogenesis,the $2n$ (diploid) spermatogonia undergo mitosis to form primary spermatocytes,which are also $2n$ (diploid).The

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Primary spermatocytes

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(B) In the process of spermatogenesis,the $2n$ (diploid) spermatogonia undergo mitosis to form primary spermatocytes,which are also $2n$ (diploid).These primary spermatocytes then undergo meiosis $I$ to form secondary spermatocytes,which are $n$ (haploid).Secondary spermatocytes undergo meiosis $II$ to form spermatids ($n$,haploid),which eventually differentiate into spermatozoa ($n$,haploid).Therefore,only the primary spermatocytes are diploid $(2n)$.

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