Question

In humans, a. How many sperm develop from 100 primary sper matocytes? b. How many sperm develop from 100 secondary spermatocytes? c. How many sperm develop from 100 spermatids? d. How many ova develop from 100 primary oocytes? e. How many ova develop from 100 secondary oocytes? f. How many ova develop from 100 polar bodies?

Answer 1

Answer:

In males primary spermatocytes undergo two meiotic divisions. First meiotic division give rise to two secondary spermatocytes and secondary meiotic division give rise to four spermatids from two spermatocytes.  

Therefore a. from 100 primary spermatocytes 400 sperms will develop (100*4= 400)

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b. From 100 secondary spermatocyteS 200 sperms will develop(100*2= 200).

c. Spermatids do not undergo any further division rather they undergo differentiation to form mature sperms. Therefore from 100 spermatids, 100 mature sperms will develop.

d. One primary oocyte gives rise to one secondary oocyte and one secondary oocyte give rise to one mature ova so only one mature ova will develop from 100 primary oocytes.

e. 100 ova will develop from 100 secondary oocytes.

f. Polar body do not develop into ova and degenerates after some time so no ova will develop from 100 polar bodies.