Allelic Expression of Drosophila Protamines during Spermatogenesis

Figure 2

Transgenic hybrids in D. simulans (a–f) and D. mauritiana (g–l). D. simulans females with the transgene possessing the GFP-tagged protamine mated to D. simulans males with RFP-tagged protamine transgene (a–c), and the reciprocal cross (d–f) fluoresces both red and green (c, f). Similarly, D. mauritiana females with the transgene possessing the GFP-tagged protamine mated to D. mauritiana males with RFP-tagged protamine transgene (g–i), and the reciprocal cross (j–l) also fluoresces both red and green (i, l), thus suggesting that protamine expression occurs during the sperm cell’s diploid phase. Images (a–c) were taken at 63x magnification, while images (d–l) were taken at 40x magnification. Bars represent 10 μm.

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