In a testis, 25 primary spermatocytes complete meiosis…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a testis, primary spermatocytes complete meiosis.
- How many secondary spermatocytes are formed?
- How many sperms are formed?
- How many chromosomes does each sperm have?
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
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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.
Given. primary spermatocytes.
Plan. Follow the two divisions of meiosis.
Step 1. Meiosis I. secondary spermatocytes.
Step 2. Meiosis II. spermatids. Each becomes one sperm, so sperms.
Step 3. Chromosomes. Meiosis halves the number from to .
Answer: secondary spermatocytes; sperms; chromosomes in each.
Check. One primary spermatocyte gives four sperms, and .
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