How does interphase look like

In cell C, the nuclear envelope is gone, no nucleoli are visible, and the chromosomes are separating from each other. In cell D, the nuclear envelope and nucleoli are distinct and the chromatin has not yet condensed. Can you put these four cells in order by where they are in the process of mitosis?

The chromosomes are no longer contained within a nuclear envelope. The spindle fibers are attaching to the kinetochores, but the chromosomes have not yet been pulled into a line. Cell B is in metaphase and the chromosomes are loosely aligned on the metaphase plate.

The sister chromatids have been pulled apart and now there are two distinct groups of chromosomes on either side of the cell. In cell B and D, the chromosomes are grouped together in the center of the cell, though they appear much more orderly in cell D.

In cells E and F, the chromosomes are in two distinct groups on either side of the cell, but are still distinguishable as individual strands. In the two cells indicated by G, there are distinguishable nucleoli and a clear nuclear envelope.

Can you place these cells in order for where they are in the cell cycle? Cytokinesis is not part of mitosis, but happens concurrently with telophase. There are two dark regions where the chromosomes are clustered and decondensing, becoming indistinguishable from each other. A fuzzy line is forming between them, indicated by a white arrow, showing cytokinesis is happening as a new cell wall forms.

Such differences reflect variation in gene expression patterns. This page appears in the following eBook. Aa Aa Aa. What Are Chromosomes? How Are Eukaryotic Chromosomes Structured? Figure 3. Figure 6: The structure of chromatin in interphase. Heterochromatin is more condensed than euchromatin. How Are Chromosomes Organized in the Nucleus?

The prokaryotic genome typically exists in the form of a circular chromosome located in the cytoplasm. In eukaryotes, however, genetic material is housed in the nucleus and tightly packaged into linear chromosomes.

Chromosomes are made up of a DNA-protein complex called chromatin that is organized into subunits called nucleosomes. The way in which eukaryotes compact and arrange their chromatin not only allows a large amount of DNA to fit in a small space, but it also helps regulate gene expression. Cell Biology for Seminars, Unit 2. Topic rooms within Cell Biology Close. No topic rooms are there.

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Do you want to LearnCast this session? This article has been posted to your Facebook page via Scitable LearnCast. Change LearnCast Settings. Scitable Chat. Register Sign In. Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes.

The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.