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  2. Prophase - Wikipedia

    en.wikipedia.org/wiki/Prophase

    Prophase is the first stage of mitosis in animal cells, and the second stage of mitosis in plant cells. [10] At the start of prophase there are two identical copies of each chromosome in the cell due to replication in interphase. These copies are referred to as sister chromatids and are attached by DNA element called the centromere. [11]

  3. Replication timing - Wikipedia

    en.wikipedia.org/wiki/Replication_timing

    [11] [12] In all multi-cellular organisms where it has been measured, early replication takes place in the interior of the nucleus and the chromatin around the periphery is replicated later. Recently developed methods to measure the points where different parts of chromosomes touch each other are almost perfectly aligned to when they replicate ...

  4. Leptotene stage - Wikipedia

    en.wikipedia.org/wiki/Leptotene_stage

    The leptotene stage, also known as leptonema, is the first of five substages of prophase I during meiosis, the specialized cell division that reduces the chromosome number by half to produce haploid gametes in sexually reproducing organisms.

  5. TikToker shares a cool science experiment for kids that you ...

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  6. Meiotic recombination checkpoint - Wikipedia

    en.wikipedia.org/wiki/Meiotic_recombination...

    Wee1 activity is high in early prophase I and the accumulation of Cdc25 activates M-Cdk by direct phosphorylation and marking Wee1 to be degraded. Meiotic recombination may begin with a double-strand break, either induced by Spo11 [2] or by other endogenous or exogenous causes of DNA damage. These DNA breaks must be repaired before metaphase I ...

  7. Preprophase - Wikipedia

    en.wikipedia.org/wiki/Preprophase

    At the beginning of preprophase, the cortical microtubules of a plant cell disappear and aggregate into a dense ring underneath the plasma membrane. This preprophase band runs around the equatorial plane of the future mitotic spindle and marks the plane of cell division and future fusion site for the cell plate.

  8. 10 Members of the Same Family Killed After Private Jet ... - AOL

    www.aol.com/lifestyle/10-members-same-family...

    Ten members of the same family have been killed after a private jet crashed minutes after taking off in southern Brazil on Sunday, Dec. 22. A statement released on the LinkedIn page of business ...

  9. How an AI granny is combating phone scams - AOL

    www.aol.com/ai-granny-combating-phone-scams...

    British mobile phone company O2 has unveiled an “AI granny” called Daisy who is helping combat fraud by wasting scammers’ time with long phone calls.

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