Question

Dictyotene is
a. Movement of dictyosomes
b. Movement of chromosomes as in synapsis
c. Prolonged diplotene stage in oocytes
d. None of the above

Answer 1

Hint: Dictyotene is also called as dictytate which occurs in the meiotic prophase in female reproductive organs, generally in females, oocytes formation started in the stage of the fetus, but the eggs remain immature and in the resting phase. Where they all maturate after birth and at the age of puberty.

Complete answer:
- It is the resting phase. of the cell division in oocytes.
- This is generally a phase of meiotic prophase I in the case of osteogenesis.
- This phase occurs in oocytes and lasts for the long term in the period of vitellogenesis
- Where there is crossing over of chromatids in chromosomes takes place early and this phase is ceased for months or years, it depends on the species.
- After the phase of crossing over occurs, the dictyotene phase of meiosis starts and the cell division stops, in this phase and it again activates once the organs reach the age of puberty.
- So in the meanwhile, primary oocytes are formed and ceased in the stage of meiosis-I.
- For the formation of secondary oocytes, meiosis II should take place and it starts only at age of maturation.
- Ovulation begins only after the formation of secondary oocytes and polar bodies.

Hence, The correct answer is option (C).

Note: The germs cells in the female reproductive system which are going to attain the meiosis are called primary oocytes. This primary oocyte stops at the stage of diplotene of the prophase I and they remain rest, just before birth all fetal oocytes attain this stage, and later the beginning of the dictyotene occurs, and crossing over takes place, later the meiosis II complete after reaching the puberty stage.