Question

State whether the following statements are true or false .
In human ovaries all oogonia mature at the same time.

• A. True
• B. False

Answer 1

The correct option is A True

In females, the total number of eggs ever to be produced are present in the newborn female initially arrested at the diplotene stage of the meiosis I from fetal life through childhood until puberty, when the lutenizing hormone (LH) surges stimulate the resumption of meiosis.

• All eggs are arrested at the prophase I of the first meiotic division as a primary oocyte.
  
• Following puberty, during each menstrual cycle, pituitary gonadotrophin stimulates completion of meiosis 1 the day before ovulation.
  

• In meiosis 1, a diploid cell becomes 2 haploid (23 chromosomes) daughter cells, each chromosome has two chromatids.
• One of the cells becomes the secondary oocyte while the other cell forms the first polar body.
  
• The secondary oocyte then commences meiosis 2 which arrests at metaphase and will not continue without fertilization.
  
• At fertilization meiosis 2 completes thus forming a second polar body.
  
• Thus we can see that all oogonia mature at the same time i.e. before birth.
  

So the correct option is ' true '.