[Drosophila] Double sex symbols

Don Shuff via dros%40net.bio.net (by donito from woh.rr.com)
Tue Mar 4 20:38:54 EST 2008

I've recently come across the use of double male or double female
symbols within the diagrams of various Drosophila crosses.  Can someone
explain to me the purpose of using two male or female symbols next to
each other?

Thank you.

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