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Here is an animation of how RNA interference works

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RNA interference (RNAi) is an important pathway that is used in many different organisms to regulate gene expression. This animation introduces the principles of RNAi involving small interfering RNAs (siRNAs) and microRNAs (miRNAs). We take you on an audio-visual journey through the steps of gene expression and show you an up-to-date view of how RNAi can silence specific mRNAs in the cytoplasm.

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This video explains what epigenetics is and how genes are expressed in our body.

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Can Your Environment Affect Your DNA? | Epigenetics Explained

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This is an article showing a further in depth view of Dolly the Clone

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This week's Retro Report video tells the story of Dolly the sheep, the first clone of an adult mammal. The Scottish scientists who created her recall the painstaking process of trying to get the experiment to work. After hundreds of tries, they successfully took a cell from an adult sheep, fused it to another sheep's unfertilized egg and implanted the resulting embryo in a surrogate mother. But Dolly's birth, and the rush of media attention that followed when the news broke in 1997, gave way almost instantaneously to fears and speculation about what this discovery meant for humanity's ability to manipulate biology. The debate only intensified in 1998, when an American scientist isolated human embryonic stem cells, which can develop into any type of cell in the body, raising the hope of a new field of regenerative medicine. Here, one of the science reporters who covered the debate for The Times offers a rearview commentary.
Some events are just too emotive to be seen clearly until long after the dust has settled. The cloning of Dolly the sheep created a public ruckus because of the assumption that sheep clones would lead straight to human clones. The generation of human embryonic stem cells raised much the same set of fears. Both cases stirred deep anxieties that science was getting out of hand and moving deep into ethically fraught territory.

But in terms of the march of science, both events were of distinctly second-order magnitude, a fact almost impossible to convey at the time. The difficult step in animal cloning had in fact been taken many years before, in the cloning of frogs, and when the Nobel Prize jurors got around to recognizing the field, they gave their award to John Gurdon, frog cloner, not to Ian Wilmut, the so-called father of Dolly.

In a similar vein, the discoverer of embryonic stem cells was Martin Evans, an English biologist who developed the technique in mice in 1981. The world only started paying attention to stem cells in 1998 when James A. Thomson of the University of Wisconsin applied Dr. Evans's recipe to people, but the Nobel Prize went to Dr. Evans.

Journalists are sometimes said to write the first draft of history. But it's hard to write history about events that are being driven by emotion. In the debate over human embryonic stem cells, the opponents were concerned that federal funding for the research, in which castoff, early-stage human embryos are destroyed, would be the first step toward federal funding of abortion. Partly in reaction, some proponents of embryonic stem cell research vastly overpromised the probable medical treatments, which, 32 years after Dr. Evans's experiment and 15 years after Dr. Thomson's, are barely visible. (Clinical trials for a treatment for macular degeneration are proceeding, but a much-heralded one for spinal cord injury was abandoned in 2011.)

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This week's Retro Report video tells the story of Dolly the sheep, the first clone of an adult mammal. The Scottish scientists who created her recall the painstaking process of trying to get the experiment to work.

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Comparing the basic differences between RNA and DNA

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(OLD VIDEO) Why RNA is Just as Cool as DNA