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Tiger Swallowtail Pterourus glaucus

male. female. Tiger Swallowtail Pterourus glaucus. male. female. What is up with this Tiger Swallowtail?. 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.

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Tiger Swallowtail Pterourus glaucus

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  1. male female Tiger SwallowtailPterourus glaucus

  2. male female What is up with this Tiger Swallowtail?

  3. An actual specimen: no photoshop!

  4. It’s a gynandromorph! • “gyn” means “female” • “andro” means “male” • “morph” means “form” • “Gynandromorph” literally means part female and part male.

  5. Vocabulary review • Zygote: fertilized egg cell • Cell differentiation: at some point in cell division, a cell becomes determinate • Sex chromosomes: X and Y • Humans: XX=female XY= male • Lepidoptera: XX=male XY or X=female • Non-disjunction: Chromosomes do not detach from each other

  6. How does this happen? • Normally, in moths & butterflies: • XX = Male • XY = 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.

  7. XX duplicated XXX X male female XX

  8. Example #2

  9. Another Example: Blue Crab female male

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