Drosophila melanogaster Cross

[TheHeroZeus]

Hi;

Drosophila melanogaster

I'm a student at molecular biology and genetic 2.Class. In genetic labratory I crossed Scarlet Female and White male.

As I search and find it ; There two gens at Drosophila :
bw+ for brown , st+ for red.

bw+st+ is wild type.

I crossed Scarlet And white so my genotips are ;

Female bwbw st+st+ Male bwbw stst

But my f1 is with brown eyes, and scarlet eyes, I have no idea about how to explain it .

Would some one help me please? What is the molecular pathway of drosophila's eyes when we cross white and scarlet

my F1: Brown and Scarlet
my f2 : White Brown Scarlet And Red

 

[GeoffP]

I don't do a lot of ordinals and a lot of my background is bloody outbreds. Can you tell me whether the source scarlet-eye and white-eye strains are reckoned to be 'fixed' for eye colour genotype? (That is, homozygous within each line.)

 

[TheHeroZeus]

Hi
for Scarlet : BwBw St+St+
For Brown Bw+Bw+ StSt
For White : Both gens knock-out : BwBw StSt

Bw gens are on the 3rd chromosome, St gens are on the 2nd.

My Scarlet Female was virgin and homozygous, my white male was Homosygous too.