In fruit flies, the wild-type eye color is red (XW) and is dominant to white eye color (Xw). Because this eye-color gene is located on the X chromosome only, reciprocal crosses do not produce the same offspring ratios. Males are said to be hemizygous, because they have only one allele for any X-linked characteristic.
What color are fruit fly eyes?
These are normal fruit flies, or “wildtypes.” Notice that their eye color is bright red. Compare them with the other fruit flies here. Notice that these flies have orange eyes. They have a defect in their “white” gene, which normally produces the red pigments in the eye.
Are purple eyes dominant in fruit flies?
In conclusion, purple eyes are recessive traits in the cross of wild type and purple-eyed Drosophila flies. … Therefore, lobe eyes are dominant traits in the cross of wild type and lobe-eyed Drosophila flies.
Is white eyes dominant or recessive in fruit flies?
The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive.
How can you tell if a fly is male or female?
The most simple characteristic to use to differentiate the two is to look at the genitalia of the flies. Males have dark, rounded genitalia at the tip of their abdomen, whereas females have light, pointed genitalia.
Can a female fruit fly have white eyes?
In fruit flies, the gene for white eyes is sex-linked recessive. … Cross a white- eyed female with a normal red-eyed male.
Are Wings dominant in fruit flies?
In fruit flies, the dominant V allele produces long wings, whereas the recessive v allele produces vestigial wings.