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Meiosis
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1.
Meiosis in a Living Crane Fly Spermatocyte: Meiosis I Still Images
James LaFountain Jr, Rudolf Oldenbourg
A. Terminal Stage of Meiosis I Prophase (Diakinesis) in a Living Crane Fly Spermatocyte
When viewed with polarized light, birefringent microtubules of the asters appear with bright contrast on the...
2.
Meiosis in a Living Crane Fly Spermatocyte: Meiosis I Time Lapse Movie
James LaFountain Jr, Rudolf Oldenbourg
The events of meiosis I in a living spermatocyte obtained from the testis of a crane-fly larva are recorded in this time-lapse sequence beginning at diakinesis through telophase to the near completion...
3.
1. Teaching Item. Meiosis II: Second Meiotic Division
4.
Meiosis in a Living Crane Fly Spermatocyte: Meiosis II Time Lapse Movie
James LaFountain Jr, Rudolf Oldenbourg
The events of meiosis II in two living spermatocytes obtained from the testis of a crane-fly larva are viewed in polarized light and recorded in this time-lapse sequence beginning at prophase II through...
5.
Telophase of Meiosis I in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
This image was made about 20 minutes after the onset of anaphase. Note that the autosomes that initiated anaphase have reached the poles, and their kinetochore fibers have essentially shortened completely....
6.
1. Teaching Item. Meiosis I: First Meiotic Division
7.
Anaphase of Meiosis I in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
This image was made at about 5 minutes after the onset of anaphase. The image is a snapshot of an early time point of anaphase - the phase of meiosis I during which disjoined half-bivalents are segregated...
8.
Terminal Stage of Meiosis I Prophase (Diakinesis) in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
When viewed with polarized light, birefringent microtubules of the asters appear with bright contrast on the dark, non-birefringent ground cytoplasm. Here the two asters are positioned on opposite sides...
9.
Transition from the Terminal Stage of Meiosis I Prophase (Diakinesis) to Prometaphase I in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
As the nuclear envelope disintegrates at the prophase-prometaphase transition, birefringent microtubules appearing with bright contrast originate from the two dark-contrasted centrosomes and penetrate...
10.
Prometaphase of Meiosis I in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
This image was made about 20 minutes following disintegration of the nuclear envelope, the event that marks the transition from prophase to prometaphase. Here, as the spindle is being assembled, the kinetochore...
11.
Metaphase of Meiosis I in a Living Crane Fly Spermatocyte
James LaFountain Jr, Rudolf Oldenbourg
In this image, made just prior to the onset of anaphase, the kinetochore fibers that connect the fully congressed bivalent chromosomes to the spindle poles stand out with exceptionally bright contrast....
12.
1. Teaching Item. Oscillating Kinetochores. E: Anaphase Lagging
13.
1. Teaching Item. Oscillating Kinetochores. B: Transition from Metaphase to Anaphase
14.
Centrosome E. Centrioles in a Live Mitotic Newt Cell Viewed by Phase Contrast
David L Ennist (The American Society for Cell Biology, Bethesda, MD)
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