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  2. Gametogenesis - Wikipedia

    en.wikipedia.org/wiki/Gametogenesis

    Premeiotic, post meiotic, pre mitotic, or postmitotic events are all possibilities if imprints are created during male and female gametogenesis. However, if only one of the daughter cells receives parental imprints following mitosis, this would result in two functionally different female gametes or two functionally different sperm cells.

  3. Genomic imprinting - Wikipedia

    en.wikipedia.org/wiki/Genomic_imprinting

    That imprinting might be a feature of mammalian development was suggested in breeding experiments in mice carrying reciprocal chromosomal translocations. [19] Nucleus transplantation experiments in mouse zygotes in the early 1980s confirmed that normal development requires the contribution of both the maternal and paternal genomes.

  4. G1 phase - Wikipedia

    en.wikipedia.org/wiki/G1_phase

    Between the beginning of the G 1 phase (which is also after mitosis has occurred) and R, the cell is known as being in the G 1-pm subphase, or the post-mitotic phase. After R and before S, the cell is known as being in G 1-ps, or the pre S phase interval of the G 1 phase. [4]

  5. Biochemical switches in the cell cycle - Wikipedia

    en.wikipedia.org/wiki/Biochemical_switches_in...

    Mitotic exit is an important transition point that signifies the end of mitosis and the onset of new G1 phase for a cell, and the cell needs to rely on specific control mechanisms to ensure that once it exits mitosis, it never returns to mitosis until it has gone through G1, S, and G2 phases and passed all the necessary checkpoints.

  6. G2 phase - Wikipedia

    en.wikipedia.org/wiki/G2_phase

    Though Wee1 is a fairly conserved negative regulator of mitotic entry, no general mechanism of cell size control in G2 has yet been elucidated. Biochemically, the end of G 2 phase occurs when a threshold level of active cyclin B1 / CDK1 complex, also known as Maturation promoting factor (MPF) has been reached. [ 4 ]

  7. Preprophase - Wikipedia

    en.wikipedia.org/wiki/Preprophase

    In contrast to animal cells, plant cells do not possess centrosomes to organize their mitotic spindles. Instead, the nuclear envelope acts as a microtubule organizing center (MTOC) for spindle formation during preprophase. The first sign is a clear, actin-free zone appearing around the nuclear envelope. [3]

  8. Preprophase band - Wikipedia

    en.wikipedia.org/wiki/Preprophase_band

    Just before mitosis starts, the preprophase band forms as a dense band of microtubules around the phragmosome and the future division plane just below the plasma membrane. It encircles the nucleus at the equatorial plane of the future mitotic spindle when dividing cells enter the G2 phase of the cell cycle after DNA replication is complete.

  9. Cellular senescence - Wikipedia

    en.wikipedia.org/wiki/Cellular_senescence

    In other organisms, where cellular senescence is observed, cells eventually become post-mitotic: they can no longer replicate themselves through the process of cellular mitosis (i.e., cells experience replicative senescence).

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