White eyes in Drosophila melanogaster result from an X-linked recessive mutation. Occasionally, white-eyed mutants give rise to offspring that possess white eyes with small red spots. The number, distribution, and size of the red spots are variable. Explain how a transposable element, or transposon, could be responsible for this spotting phenomenon.

Question

03-08-2019
Biology

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White eyes in Drosophila melanogaster result from an X-linked recessive mutation. Occasionally, white-eyed mutants give rise to offspring that possess white eyes with small red spots. The number, distribution, and size of the red spots are variable. Explain how a transposable element, or transposon, could be responsible for this spotting phenomenon.

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Larus Larus · Answer 1 · 2019-08-09T04:20:06+02:00

Answer:

It is not possible that a transposon would get introduced into similar locus in various eye cells. Though the transposons that take place in the differentiating cells can eventually influence various cells. The existence of a transposon in the locus of the eye color affects the generation of red pigment.

Thus, excision of a transposable element out of the locus of the eye color at the time of the development of an eye generates a patch of cells, which generate red pigment.