wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

What is the difference between a primary oocyte and a secondary oocyte?

Open in App
Solution

Primary and secondary oocytes

Oogenesis is the process of formation of ovum in the female reproductive system.

The primary oocyte is formed from the oogonia whereas the secondary oocyte is formed when the primary oocyte undergoes meiosis.

Cell involved in division

Primary oocytes are formed from the oogonia by the mitotic division. Secondary oocytes are formed from the primary oocytes by first meiotic division.

Period of development

Primary oocytes are formed during the embryonic development and the secondary oocytes are developed during puberty.

Number of chromosomes present

Primary oocytes contain 46 chromosomes. Secondary oocytes contain 23 chromosomes.

Ploidy

Primary oocytes are diploid (2n) and secondary oocytes are haploid (n).

Summary

CriteriaPrimary oocyteSecondary oocyteCells involved in division OogoniaPrimary oocytePeriod of development Develops during embryonic stageDevelops during pubertNumber of chromosomes present 4623Ploidy 2n n


flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon