Pages, some stolen, some original

Wednesday, March 22, 2017

Twisting DNA


Why Women Are Stripey

They (women) aren't actually stripey, at least they don't look that way because we don't have chromosome vision.  I liked the animation, and the bit about the cellualar level fight between the two X-chromosomes was interesting. Makes me wonder if the same thing is going with all the other normally paired chromosomes.

The part that isn't explained here, and which I haven't seen anywhere, is how DNA gets untwisted enough that it can be read. Because DNA isn't just twisted like a rope, it's curled up, and then recurled, and then curled some more, as this video shows.


✔ DNA Replication Animation - Super EASY

(www.freesciencelectures.com, shown on the bottom of the video doesn't exist, though there is a YouTube channel with that name.)

It might be that the DNA does get completely untwisted when only a short segment needs to get copied. In that case perhaps only a short segment gets untwisted, kind of like when you are trying to splice a rope or cable.


Fastest loadsling splicer...1 1/8" X 28' .in 3min 20sec (greasy rope).DCR (www.chainandrigging.com)


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