Spermatogenesis and Oogenesis
publish date: 2026/06/17 19:54:00 UTC
Gametogenesis: Two Meiotic Divisions Spermatogenesis Primary spermatocyte Meiosis I two secondary spermatocytes Meiosis II four spermatids (mature into spermatozoa) Oogenesis Primary oocyte Meiosis I secondary oocyte 1st polar body Meiosis II ootid → ovum 2nd polar body one functional egg (unequal cytoplasm division) Spermatogenesis divides cytoplasm equally, producing four equal sperm. Oogenesis divides cytoplasm unequally, producing one large egg.
Based on the diagram, how many functional sperm cells result from one primary spermatocyte after both meiotic divisions?
Correct Answer
Explanation
A single diploid primary spermatocyte undergoes meiosis I and meiosis II, producing four spermatids of equal size, which then mature into spermatozoa. This is different from oogenesis, where unequal cytoplasmic division produces just one functional egg.
Reference
Biology: A self-teaching guide