In the ovary,estrogen is secreted by . . . . . . .

  • A
    Follicular cells
  • B
    Corona radiata cells
  • C
    Sertoli cells
  • D
    Primary oocyte

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Mammalian eggs have

Determine the ploidy of the following cells in the process of spermatogenesis:
Spermatozoa,Secondary spermatocyte,Spermatid,Spermatogonia,Primary spermatocyte.

Explain the difference between the following terms:
$(1)$ Spermatid - Spermatozoa
$(2)$ First polar body - Second polar body

What are the changes in the oogonia during the transition of a primary follicle to Graafian follicle?

The schematic representation of spermatogenesis is given below. How many chromosomes do $P$,$Q$,and $R$ contain?
$P$ (Spermatogonia) $\rightarrow$ $Q$ (Primary Spermatocyte) $\rightarrow$ $R$ (Spermatid)

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