Down's is caused by an extra chromosome. And yes, women tend to be shorter than men. Fraternal twins can look very different, I have several friends who are fraternal twins who barely look related.
To the OP - you just make me happy that people still read books :) TV movies especially tend to not be very true to the source material. I came here to see if people liked the book, since I felt like there was a lot missing in the film. The wigs were absolutely dreadful! :) Looked like they were just sitting on the actors' heads like awful hairy hats ;0)
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