NEETZoologyHuman Reproduction
The entry of a sperm into a secondary oocyte induces the completion of its meiotic division. Which of the following represents the immediate cellular products of this specific division?
Options
- AA secondary oocyte and a first polar body
- BAn ootid and a second polar body
- CTwo equal-sized haploid ova
- DA primary oocyte and a second polar body
Correct answer
B. An ootid and a second polar body
Step-by-step solution
The entry of a sperm into the secondary oocyte breaks its arrest at metaphase II and induces the completion of the second meiotic division. This second meiotic division is unequal and results in the formation of a large haploid cell called the ootid (or ovum) and a tiny second polar body. The formation of a secondary oocyte and a first polar body occurs upon the completion of the first meiotic division prior to ovulation. Oogenesis in humans is characterized by unequal divisions, hence two equal-sized ova are never