enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Chromatin - Wikipedia

    en.wikipedia.org/wiki/Chromatin

    The precise structure of the chromatin fiber in the cell is not known in detail. [10] This level of chromatin structure is thought to be the form of heterochromatin, which contains mostly transcriptionally silent genes. Electron microscopy studies have demonstrated that the 30 nm fiber is highly dynamic such that it unfolds into a 10 nm fiber ...

  3. Chromosome - Wikipedia

    en.wikipedia.org/wiki/Chromosome

    Chromatin contains the vast majority of the DNA in an organism, but a small amount inherited maternally can be found in the mitochondria. It is present in most cells, with a few exceptions, for example, red blood cells. Histones are responsible for the first and most basic unit of chromosome organization, the nucleosome.

  4. Transgenerational epigenetic inheritance - Wikipedia

    en.wikipedia.org/wiki/Transgenerational...

    This transmission of programming can also alter the chromatin and histone of the DNA and can be passed through the cytosol from parent to offspring during meiosis. [ 10 ] Histone modifications in which the structure of chromatin and its transcriptional state is regulated.

  5. DNA methylation - Wikipedia

    en.wikipedia.org/wiki/DNA_methylation

    The percentage methylation of individual CpG islands can be determined by quantifying the amount of the target in each fraction. [citation needed] Extremely sensitive detection can be achieved in FFPE tissues with abscription-based detection. High Resolution Melt Analysis (HRM or HRMA), is a post-PCR analytical technique. The target DNA is ...

  6. Sister chromatids - Wikipedia

    en.wikipedia.org/wiki/Sister_chromatids

    Compare sister chromatids to homologous chromosomes, which are the two different copies of a chromosome that diploid organisms (like humans) inherit, one from each parent. Sister chromatids are by and large identical (since they carry the same alleles, also called variants or versions, of genes) because they derive from one original chromosome.

  7. Gene - Wikipedia

    en.wikipedia.org/wiki/Gene

    Genetic disorders are the result of deleterious mutations and can be due to spontaneous mutation in the affected individual, or can be inherited. Finally, a small fraction of mutations are beneficial , improving the organism's fitness and are extremely important for evolution, since their directional selection leads to adaptive evolution .

  8. Euchromatin - Wikipedia

    en.wikipedia.org/wiki/Euchromatin

    Epigenetics involves changes in the phenotype that can be inherited without changing the DNA sequence. This can occur through many types of environmental interactions. [16] Regarding euchromatin, post-translational modifications of the histones can alter the structure of chromatin, resulting in altered gene expression without changing the DNA. [17]

  9. DNA - Wikipedia

    en.wikipedia.org/wiki/DNA

    Cell-free fetal DNA is found in the blood of the mother, and can be sequenced to determine a great deal of information about the developing fetus. [ 113 ] Under the name of environmental DNA eDNA has seen increased use in the natural sciences as a survey tool for ecology , monitoring the movements and presence of species in water, air, or on ...