Morgan started raising the mutant white-eyed flies and discovered that after one generation, just the males had the feature. Morgan discovered that the genetic component governing fly eye color was located on the same chromosomal that defined sex during more breeding studies.
The color of a bird's wings absorbs ambient light. Butterfly color pigmentation affects the phenotypic manifestation of wing form.
Morgan found a mutation that changed the hue of a fly's eyes. He noticed that male and female flies inherited the mutation in distinct ways. Morgan came to the conclusion that the eye color gene must be placed on the X chromosome depending on the inheritance pattern.
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