Ted Shoemaker  wrote or quoted:

> If chromosomal imbalance is the reason for anything, then how does
> (for example) the XY pair work in humans?  One chromosome is longer
> than the other, so I'm told, which means that the longer one is
> partially unpaired.

....in males.  The Y chromosome does not cross over with the X
chromosome - so it does not matter that they are different sizes.

> When I did ask, I found that some creatures do indeed have other than
> 2 sets of chromosomes.  In fact, one website says that some plants
> (duckweed, I think?) can have up to *7* sets!

Many strawberries are octoploid.  /Some/ strawberries are decaploid ;-)
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