X And 4 Double Nondisjunctional progeny

Normal | 4-only | X-only | X and 4 Doubles

The text in parentheses below shows the chromosome content of the oocyte, followed by the phenotype of the progeny.  Remember, only genes for which the fly is mutant are listed, so all other markers are wildtype.

X-linked markers:

yellow (y): The body color is golden brown (wildtype: body is coffee brown)

white (w): The eye color is white (wildtype: eyes are brick red)

Bar (B): A dominant gene that changes the shape of the eye.

    Wildtype (+/+) gives oval eyes

    B/+ gives kidney bean eyes

    B/B (or B/Y males) have narrow, slit-shaped eyes.

vermillion (v): The eye color is a bright orange-red (wildtype: eyes are brick red)

forked (f): Back bristles are shorter, twisted and split (wildtype: bristles long and straight)

4-linked markers:

poliert (pol): The eye surface texture is glazed over and shiny (wildtype: compound eye has separate facets)

cubitus interruptus (ci): The cubitus vein on the wing has gaps or is missing (wildtype: vein is continuous)

eyeless, Russian allele (eyR): The eye is round instead of oval, and smaller.  Variable expression, eye can go from just smaller than normal to completely absent.

Nullo-X Diplo-4 Male (Ø 44) v f B; pol

These males are v f B and are pol.  Scoring pol can be hard because of the reduced eye size; you have to rely on the lack of a clear demarcation between the surrounding cuticle and the eye surface.  One way to picture this is as if someone had painted over the eye with clear varnish. 

Diplo-X Nullo-4 Female (XX Ø) y w B; ci eyR

The interaction between Bar and eyR can lead to a greatly reduced eye, as shown here.  These females are also mutant for yellow.

Nullo-X Nullo-4 Male (Ø Ø) v f B; ci eyR

Note the eye is colored, the bristles on the back of the thorax are bent, and the body is wildtype color, indicating this is male received the v f B chromosome.  The ci defect on the wing is visible here (arrow).

A better shot of the ci defects in the same male.

The interaction between eyeless and Bar is variable. Here is the left eye of the male, still showing a few ommatidia near the edges (and a better look at the forked bristles on the thorax).

The other eye of the same male, showing a more extreme combined eyeless + Bar outcome.

Diplo-X Diplo-4 Female (XX 44) y w B; pol

Getting both X and both 4 chromosomes from the mother makes these females yellow, white and poliert.

A closeup on the eye from the same female shows the pol phenotype as well as the nice kidney-bean dimple on the anterior edge.  Theres still a bit of a trench around the edge of the eye, but its less sharply defined than in wildtype.