Question

1. Give a schematic representation of oogenesis in human females.
2. Mention the number of chromosomes at each stage. Correlate the life phases of the individual with the stages of the process.

Give the schematic representation of oogenesis in human female. Indicate chromosome number also.

Answer 1

1. 
   
2. Chromosome number and life phases:
   

   Stage	Chromosome Number	Life Phase Correlation
   Oogonium	2n (46)	Fetal development
   Primary oocyte	2n (46)	Fetal development is arrested at prophase I until puberty.
   Secondary oocyte	n (23)	From puberty until menopause, ova are released monthly during ovulation and arrested at metaphase II.
   Ovum	n (23)	After fertilisation, completes meiosis II
   Polar bodies	n (23)	Degenerate and play no further role