Bananas grow in [bunches](https://c8.alamy.com/comp/FAFK3P/close-up-green-banana-bunch-in-tree-FAFK3P.jpg) so bananas on different parts of the bunch can wind up being different sizes.
That said, _all_ bananas aren’t clones. All bananas of any particular variety are clones, and the vast majority of bananas in grocery stores come from a single variety and are therefore clones of each other. But you _do_ sometimes see other kinds of bananas in grocery stores (more often if you live somewhere tropical). But even in colder areas you sometimes see little half-size bananas that are just a different variety and not clones of standard bananas (but are all clones of each other).
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