Normal ad1 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.

Normal Male (X 4) y w     or     y w B

The mother in the AD1 cross is FM7 y w B / y w.  Therefore her normal sons get a single X chromosome, which can be either y w or FM7. 

An example y w male.  Note the dark spots on the front pair of legs, which are the sex combs.

A close-up view of the y w eye, showing the regular packing of the compound eye facets.  The eye is wildtype for Bar, and so is large and oval shaped.

Below is a normal FM7 male.  You may note that the bristles are slightly darker (the FM7 chromosome carries a different yellow allele than the y w chromosome, which makes the body golden but the bristles black.)

The Bar eye is shown here; you can still see the facets even though the eye size is reduced.

The male external genitalia.  Note the horseshoe-shaped ring of bristles, and the melanization of the tip of the abdomen.

Normal Female (X 4) B

Normal females are wildtype except for being Bar.  Since females can have one copy of Bar (y w / v f B) or two copies (FM7 y w B / v f B), the exact eye shape can be quite variable.

A closer view of the eye.  Note the compound facets and brick-reddish color.  This female is heterozygous for Bar, so the eye is not oval shaped.

The female external genitalia.  Note the lack of the ring of bristles around the orifice and lack of melanization of the tip of the abdomen as seen in males.