Twelve primary oocytes complete meiosis, and every secondary oocyte is fertilised…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Twelve primary oocytes complete meiosis, and every secondary oocyte is fertilised. Assume that each first polar body divides too, so the largest possible number of polar bodies is formed.
- How many ova are formed?
- How many polar bodies are formed?
- How many cells are formed in all?
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.
Given. primary oocytes.
Plan. Count the products of one primary oocyte, then multiply by .
Step 1. Ova. One primary oocyte gives ovum, so ova.
Step 2. Polar bodies. The first division gives one polar body, and it divides into two. The second division of the oocyte gives another. That is for each primary oocyte, so .
Step 3. All cells. .
Answer: ova; polar bodies; cells.
Check. The same cells would give sperms in the male. The number of cells is the same, but only a few become gametes in the female.
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