Most oranges have one fruit inside the outer skin. Sometimes there's a second baby orange growing inside the skin of the orange. I wonder what causes the second orange to grow, and whether it has an official name.
Some oranges have a baby separate orange growing in the same skin. What causes that? Biological name?
A mutation causes navel oranges to develop a second seedless orange at the base of the original fruit, opposite the stem. This second orange develops as a conjoined twin in a set of smaller segments embedded within the peel of the larger orange.
From outside the smaller "twin" forms a structure at the bottom of the fruit that looks a bit similar to the human navel.
Therefore the name navel orange.
They are propagated asexually, usually by grafting.
See "navel orange" for more details:
http://www.producepete.com/shows/califor...
http://en.wikipedia.org/wiki/Orange_(fru...
grappling
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