All your DNA is contained inside the ____ The long thread of DNA wraps around proteins clustered into little beads called ____ The book of you would have ____ chapters, one for each chromosome. Two of those chapters, called "X" and "Y", determine if you are ____ , "XY", or ____ , "XX". It's estimated that all the chapters together hold about 20,000 individual instructions, called ____ . It turns out that our genome book is much, much longer than just those 30 million letters, almost 100 times longer! What are all those extra pages for? Well, each page of instructions has a few pages of nonsense inserted that have to be taken out before we end up with something useful. The parts we throw out, we call ____. The instructions we keep, we call ____.

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