enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  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. Cell division - Wikipedia

    en.wikipedia.org/wiki/Cell_division

    Interphase is the process through which a cell must go before mitosis, meiosis, and cytokinesis. [15] Interphase consists of three main phases: G 1, S, and G 2. G 1 is a time of growth for the cell where specialized cellular functions occur in order to prepare the cell for DNA replication. [16]

  5. 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]

  6. 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.

  7. 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 ]

  8. Germline development - Wikipedia

    en.wikipedia.org/wiki/Germline_development

    Mitotic germ stem cells, oogonia, divide by mitosis to produce primary oocytes committed to meiosis. Unlike sperm production, oocyte production is not continuous. These primary oocytes begin meiosis but pause in diplotene of meiosis I while in the embryo. All of the oogonia and many primary oocytes die before birth.

  9. Animal embryonic development - Wikipedia

    en.wikipedia.org/wiki/Animal_embryonic_development

    In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1] Once fertilized, the ovum becomes a single diploid cell known as a zygote.