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Question
In which phase of cell division are oogonia arrested?
In which phase of cell division are oogonia arrested?
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Solution
The correct option is B Anaphase I
In females, oogenesis starts at embryonic age and forms millions of oogonia. These cells start dividing and temporarily arrested at prophase-1 called primary oocyte. These oocyte acquires granulosa cells and forms primary follicles which degenerate from birth to puberty. Further, they form secondary and tertiary follicles. When tertiary follicle grows in size it completes its first meiotic division and releases first polar body and secondary oocyte. Secondary oocyte completes its second meiotic division after the entry of sperms and releases second polar body. So, the correct option is 'Anaphase I'.
In females, oogenesis starts at embryonic age and forms millions of oogonia. These cells start dividing and temporarily arrested at prophase-1 called primary oocyte. These oocyte acquires granulosa cells and forms primary follicles which degenerate from birth to puberty. Further, they form secondary and tertiary follicles. When tertiary follicle grows in size it completes its first meiotic division and releases first polar body and secondary oocyte. Secondary oocyte completes its second meiotic division after the entry of sperms and releases second polar body.
So, the correct option is 'Anaphase I'.
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