tiger swallowtail pterourus glaucus
Post on 22-Feb-2016
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Tiger SwallowtailPterourus glaucus
malefemale
What is up with this Tiger Swallowtail?
malefemale
An actual specimen: no photoshop!
It’s a gynandromorph!
• “gyn” means “female”• “andro” means “male”• “morph” means “form”• “Gynandromorph” literally means part
female and part male.
How does this happen?•Normally, in moths & butterflies:
XX = MaleXY = Female
•If the butterfly has two or more “X” chromosomes, it will develop as a male. With only one “X” chromosome, it will be a female.
•In arthropods, the first cell division differentiates left from right.
•Bilateral gynandromorphs arise by mitotic nondisjunction in the sex chromosomes at this one-two cell stage.
XX
XXduplicated
XXXmale female
X
Example #2
Male Female
Example #3
Example #4
Another Example: Blue Crab
malefemale
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