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Originally Posted by skier
I've got a non-rhetorical question about biology.
When chromosomes cross over, is any point on the chromatid equally likely to cross over?
Or do the ends cross over more often?
Does any crossing over happen at the centromere?
if not, what sort of genetic information gets put there in the middle where it wouldn't cross over?
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NO - statistically, the chromosomes towards the ends of the tetrads are crossed far more frequently. Crossover occuring closer into the centromere is pretty unlikely due to the actual mechanics involved - if not actually impossible (I'd have to check on that part).
As they're still mapping the genome, I don't know what information is most likely to be in the middle. Going off the top of my head, I'd say those would be the things that you notice being inherited together. I.e., if the gene loci (actual location on the chromosome) for green flecks in your eyes was next to the gene loci for blond highlights, then anyone who had one would have the other, almost always.
