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. excision of a transposable element out of the eye color locus during eye development produces a patch of cells that produce red pigment. a transposable element is introduced into the regulatory region of the eye color gene and causes gene expression to be reduced, which results in white eyes with red spots. insertion of a transposon upstream of the eye color locus during eye development activates the red pigment production gene in a patch of eye cells. a transposon located within the eye color gene uses reverse transcriptase to produce the normal gene product, which causes white eyes with red spots. transposable elements insert into the eye color locus in the majority of the eye cells, leaving only a patch of eye cells with an active eye color locus that produces red pigment.
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Biology, 22.06.2019 06:30, DwayneLeonard618
Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.
Answers: 2
White eyes in drosophila melanogaster result from an x‑linked recessive mutation. occasionally, whit...
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