Introducing Epigenetics, Cath Ennis
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Cath Ennis

Introducing Epigenetics

Laura Lucia
Laura Luciahat Zitat gemachtvor 2 Monaten
“Epi-” means upon, or in addition; epigenetics is the study of how additional factors interact with genes to direct the processes that make our cells* and bodies work.
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nature (our genes) and nurture (our environment, experiences and other non-genetic factors)
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However, a few hundred imprinted genes are transcribed from only the maternally-inherited chromosome, and others from only the paternally-inherited chromosome.
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obiteljkosic01hat Zitat gemachtvor 4 Monaten
every cell in the human body contains exactly the same DNA as the original fertilized zygote.
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obiteljkosic01hat Zitat gemachtvor 4 Monaten
This experiment proved that fully differentiated cells retain all the genetic material needed to produce every cell in the body.
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DNA was characterized in 1953 by Watson, Crick, Wilkins and Franklin.
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exception, identical twins, come from a single fertilized zygote that splits in two.
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Each of the four new cells created during a single meiosis event therefore receives 23 chromosomes, rather than the 23 pairs of chromosomes found in most other cells.
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The combination of DNA, histones and scaffold proteins, plus other proteins and RNAs that bind to the overall structure, is called chromatin*.
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The nucleosomes that assemble along a stretch of DNA look like beads on a string.
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The longest human chromosome contains about 2,600 protein-coding genes; the smallest, just 140. Genes are separated by stretches of non-protein-coding DNA.
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