Spermatogenesis in mammals involves both mitosis and meiosis. Type AS spermatogonia can undergo mitosis to form type Al spermatogonia, which in turn undergo mitosis to form type B spermatogonia. Type B spermatogonia undergo a final round of mitosis to form primary spermatocytes. Primary spermatocytes undergo the first meiotic division to make secondary spermatocytes, and these undergo the second meiotic division to form spermatids. Spermatids then enters spermiogenesis to form sperm. If the spermatids have a ploidy of 1n and are haploid, which cells would have a ploidy of 4n?

Question

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a
Type AS spermatogonia

b
Type Al spermatogonia

c
Type B spermatogonia

d
Primary spermatocytes

e
Secondary spermatocytes

Answer 1

d. Primary spermatocytes