Say whether each feature belongs to spermatogenesis, to oogenesis, or to both…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether each feature belongs to spermatogenesis, to oogenesis, or to both.
- It begins at puberty.
- The cell stops in prophase of meiosis I for many years.
- Both meiotic divisions give daughter cells of equal size.
- FSH acts on the Sertoli cells to help it.
- It gives polar bodies.
- The cells made are haploid.
Need a reminder? The key ideaShow
A spermatogonium has chromosomes. A primary spermatocyte divides by meiosis I into two secondary spermatocytes ( chromosomes each). Each of these divides by meiosis II into two spermatids. Each spermatid becomes one sperm. A primary oocyte gives one ovum and up to three polar bodies. LH acts on the Leydig cells, and FSH acts on the Sertoli cells.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Spermatogenesis.
Step 2. (b) Oogenesis. The primary oocyte waits in prophase I from the time of the foetus.
Step 3. (c) Spermatogenesis. In oogenesis the divisions are unequal.
Step 4. (d) Spermatogenesis. The Sertoli cells are in the testis.
Step 5. (e) Oogenesis.
Step 6. (f) Both. Meiosis makes haploid cells in both.
Answer: (a) spermatogenesis; (b) oogenesis; (c) spermatogenesis; (d) spermatogenesis; (e) oogenesis; (f) both.
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