For the animal cell sketch the process of meiosis. Needs to illustrate the process from start to finish, and highlight the chromosomal condition of cells through the meiotic phase Include the labels of: Interphase Mitotic (must includemeiosis I and meiosis II for prophase, metaphase, anaphase, telophase, and cytokinesis)
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
For the animal cell sketch the process of meiosis. Needs to illustrate the process from start to finish, and highlight the chromosomal condition of cells through the meiotic phase
Include the labels of:
Interphase
Mitotic (must includemeiosis I and meiosis II for prophase, metaphase, anaphase, telophase, and cytokinesis)
Meiosis and mitosis are closely related. For example, the interphase is similar in both cell cycles. The cell grows, DNA replicates, and the cell produces the enzymes and other proteins that are required for the division of the cell in each case.
Meiosis has two stages: meiosis I and meiosis II. They distribute the DNA from one specialized diploid cell into four haploid nuclei. Meiosis mix-up genetic information to receive a unique mixture of alleles.
The following figure illustrates the stages of meiosis.
During prophase I of meiosis I, the replicated chromosomes condense. A spindle starts to develop from microtubules assembled at the centrosomes, spindle attachment points expand on each centromere, and the nuclear envelope breaks up. Each chromosome lines up next to its homolog.
In metaphase I, the spindle arranges the paired homologous chromosomes down the center of the cell. Each piece of a homologous pair attaches to a spindle fiber stretching to one pole. Homologous pairs separate in anaphase I, and the chromosomes complete their movement to opposite poles in telophase I. Cytokinesis (cytoplasmic division) typically occurs after telophase I, dividing the original cell into two.
The second interphase precedes meiosis II in several species. During this period, the chromosomes unwind into very thin threads. The cell produces proteins, but the "DNA does not replicate" a second time. Meiosis II greatly correlates mitosis. The process begins with prophase II when the chromosomes again condense and become visible. In metaphase II, the spindle arranges the chromosomes along the center of each cell. In anaphase II, the centromeres split, and the separated sister chromatids move to opposite poles. In telophase II, nuclear envelopes appear around the separated chromosomes. Cytokinesis then separates the nuclei into daughter cells. Therefore, meiosis divides one diploid cell into four haploid cells.
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