With reference to the above schematic representation of (a) SQPermatogenesis and (b) Oogenesis answer the following questions:
(a) About 300 million SQPermatozoa may be present in a human male ejaculation at one time. Calculate how many SQPermatocytes will be involved to produce 300 SQPermatozoa.
(b) How many chromatids are found during Oogenesis in (i) Primary oocyte and (ii) First polar body in a human female?

Explanation

(a) Each primary SQPermatocyte will undergo meiosis-I and meiosis-2 which will result in 4 SQPermatozoa
`300` million`//4=75` million
(b) Since replication has occurred by this stage
`46xx2=92` chromatids
Meiosis `-I` is completed by this time `92//2=46` chromatids -