Could anyone please explain if a drosophila melanogaster line can express some white eye flies whereas its wild type is red eye. Is this fading out possible or is it a contamination?
at a time point in most pairs and usually white gene extend beyond eye color pigment due to some gene transfer.
No, wild type eyes cannot fade to white overtime. If white-eyed flies are showing up in your cultures, it is contamination.
As the white eye gene is on the X chromosome, heterozygous females will be red-eyed but carry the white eye gene. if these females are mated to a wildtype male, half of their male offspring will be white eyed, half of the female offspring will be heterozygous carriers of the white eye gene. If the heterozygous females are mated to white eye males, half of the males will be wild type and half of the females will be wildtype. Clearly you have some heterzygotes in your cultures.
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