What is the difference between euchromatin and heterochromatin quizlet?
What is the difference between euchromatin and heterochromatin quizlet?
What is the difference between euchromatin and heterochromatin? Euchromatin has regular cycles of condensation and decondensation between interphase and mitosis, whereas heterochromatin remains highly condensed throughout cycle (except for at replication).
What is the function of euchromatin and heterochromatin?
Euchromatin can be transitioned into heterochromatin, which can control gene expression within a cell. Processes, such as the cell cycle, use this to regulate the transcription of different genes throughout the cell cycle. The transition can occur in other events, such as during an infection.
Is there more heterochromatin or euchromatin?
Euchromatin is prevalent in cells that are active in the transcription of many of their genes while heterochromatin is most abundant in cells that are less active or not active.
Why is heterochromatin inactive?
The two types of chromatin, heterochromatin and euchromatin, are functionally and structurally distinct regions of the genome. Heterochromatin is densely packed and inaccessible to transcription factors so it is rendered transcriptionally silent (Richards and Elgin 2002).
What is the purpose of heterochromatin?
Heterochromatin has been associated with several functions, from gene regulation to the protection of chromosome integrity; some of these roles can be attributed to the dense packing of DNA, which makes it less accessible to protein factors that usually bind DNA or its associated factors.
Why is euchromatin lightly colored?
In general, euchromatin appears as light-colored bands when stained in G banding and observed under an optical microscope, in contrast to heterochromatin, which stains darkly. This lighter staining is due to the less compact structure of euchromatin.
Is euchromatin stain lightly?
Euchromatin stains lightly whereas heterochromatin stains darkly. The lighter staining is due to their slightly packed structure of euchromatin.
What color is heterochromatin?
The patches of heterochromatin are much smaller than the nucleoli, and stain more blue, the same color as the heterochromatin at the outer edge of the nucleus.
What are heterochromatin regions?
Heterochromatin Within the Drosophila Genome Heterochromatin, originally identified via cytological studies using the polytene chromosome, is defined as chromatin regions that maintain a dense staining and condensation pattern throughout the cell cycle [61,64].
What are the two types of heterochromatin NCBI?
The best-studied types of heterochromatin are marked by the addition of one (me1), two (me2) or three (me3) methyl groups to histone H3 lysine 9 (H3K9me) or lysine 27 (H3K27me).
How can heterochromatin spread?
Since the major mechanism of heterochromatin spreading is through repeated cycles of histone modifications and binding of chromatin proteins, it is not surprising that most boundary elements function by blocking this cycle by, for example, recruiting antagonizing histone modifying activities, protecting euchromatic …
What is accomplished during mitosis?
Mitosis is a process where a single cell divides into two identical daughter cells (cell division). During mitosis one cell? divides once to form two identical cells. The major purpose of mitosis is for growth and to replace worn out cells.
What is the importance mitosis?
Mitosis is a way of making more cells that are genetically the same as the parent cell. It plays an important part in the development of embryos, and it is important for the growth and development of our bodies as well. Mitosis produces new cells, and replaces cells that are old, lost or damaged.
What are the three main purposes of mitosis?
Mitosis is important for three main reasons: development and growth cell replacement and asexual reproduction.
What is the typical result of mitosis in humans?
two diploid cells
What are the end products of mitosis?
Mitosis ends with 2 identical cells, each with 2N chromosomes and 2X DNA content. All eukaryotic cells replicate via mitosis, except germline cells that undergo meiosis (see below) to produce gametes (eggs and sperm).