Is it possible to cross two red eyed fruit flies and get a white eyed fly?

The reciprocal cross gives a different result. A reciprocal cross between white-eyed females and red-eyed males gives an F1 in which all the females are red eyed, but all the males are white eyed. The F2 consists of one-half red-eyed and one-half white-eyed flies of both sexes.

Would it ever be possible to cross two red eyed fruit flies and get a white eyed fly?

Surprisingly, this cross yielded a 1:1:1:1 ratio of red-eyed females to white-eyed females to red-eyed males to white-eyed males. … All possible combinations of white eyes and sex are possible. The white-eye trait can be carried over to females when F1 females are crossed with white-eyed males.

What happens when you cross a white eyed female fruit fly with a red eyed male fruit fly?

A white-eyed female fruit fly is crossed with a red-eyed male. Red eyes are dominant, and X-linked. What are the expected phenotypes of the offspring? All of the females will have red eyes; half of the males will have red eyes, and half of the males will have white eyes.

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Can male fruit flies have white eyes?

The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.

What was the gender of all of the white-eyed flies?

Although the first generation of 1,237 offspring was all red-eyed but for three, white-eyed flies appeared in larger numbers in the second generation. Surprisingly, all white-eyed flies were male.

What does a female fruit fly need for white eyes?

1. In fruit flies, the gene for white eyes is sex-linked recessive. (R) is red and (r) is white. Cross a white- eyed female with a normal red-eyed male.

What would be the result of a cross between a white eyed female and a red eyed male?

The genotypes are shown in Figure 2-15 . The reciprocal cross gives a different result. A reciprocal cross between white-eyed females and red-eyed males gives an F1 in which all the females are red eyed, but all the males are white eyed.

What gene is mutated in the white-eyed flies?

The Drosophila gene w (CG2759) is a central part of the eye-pigmentation pathway. It encodes an ATP binding cassette transporter, White (O’Hare et al., 1984; Pepling and Mount, 1990), that forms dimers with either Brown or Scarlet proteins, encoded by brown and scarlet genes respectively.

What is the genotype of the white-eyed male?

The male is hemizygous for both the recessive (white) eye color allele and dominant (tan) body color allele. His genotype is Xwy+ Y.

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