Is the Number of Spindles Attached to Bivalents in Metaphase 1 Correct?

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SUMMARY

In metaphase 1 of meiosis, each chromosome of a bivalent attaches with two spindles, which is a definitive fact supported by cellular biology. The confusion arises from differing interpretations of images and descriptions in textbooks, with some suggesting that three spindles attach to each chromosome. However, the consensus is that two spindles are responsible for the separation of bivalents during this phase, ensuring proper distribution to future cells. Additionally, the migration of bivalents towards the metaphase plate is correctly stated in educational materials.

PREREQUISITES
  • Understanding of meiosis and its stages, particularly metaphase 1.
  • Familiarity with spindle fiber dynamics and their role in chromosome separation.
  • Knowledge of microscopy techniques, such as GFP-marked microtubuli visualization.
  • Basic concepts of bivalents and chromosome structure.
NEXT STEPS
  • Research the mechanics of spindle fiber attachment during meiosis.
  • Explore the role of GFP-marked microtubuli in visualizing cell division.
  • Study the differences between metaphase in mitosis and meiosis.
  • Investigate common misconceptions in meiosis as presented in educational resources.
USEFUL FOR

Students of biology, educators teaching meiosis, and researchers interested in cellular division processes will benefit from this discussion.

gracy
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Each chromosome of a bivalent attaches with two spindles in metaphase.It's correct,right?
as i can see from the below image
Metaphase1.jpg

but my book says it's wrong.and i am confused because i can see different types of images
according to the image below each chromosome of a bivalent attaches with three spindles in metaphase .
metaphase-I.gif

I think each chromosome of a bivalent attaches with many spindles in metaphase 1.That's why in book it is written that each chromosome of a bivalent attaches with two spindles in metaphase 1 is wrong statement.

And in metaphase 1, bivalents migrate towards metaphasic plate.In my book it is also declared as wrong statement but I think it's correct.
 
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You mean the first one draws two fibers and the second one three?

There are two spindles, one for each future cell.

As for the fibers, there's videos that show GFP-marked microtubuli during cell division.

You can count the fibers if you feel like.
 

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