During which phase, spermatogonium changes into primary spermatocyte?

Sperms formed from 4 primary spermatocytes are

What will be the ratio between sperms and ova produced form 25 primary spermatocytes. And 25 primary oocytes? Explain with reasons.

In which phase crossing over occurs?

Write the specifie location and the functions of the following cells in human males:Primary spermatocyte

How many spermatozoa are produced from a secondary spermatocyte and how many ova are produced from a primary oocyte?

Name the factor which affect the primary productivity?

Differentiate between the following: Primary spermatocyte and secondary spermatocyte.

How many sperms will be produced from 100 primary spermatocytes ad how many eggs will be produced form 100 primary oocytes?

During which phase of interphase duplication of mitochondria and plastids occur?