In a study of Drosophila, two normally active genes, w+ (wild-type allele of the white-eye gene) and hsp26 (a heat-shock gene), were introduced (using a plasmid vector) into euchro-matic and heterochromatic chromosomal regions, and the relative activity of each gene was assessed (Sun et al., 2002). An approximation of the resulting data is shown in the following table. Which characteristic or characteristics of heterochromatin are supported by the experimental data?
Gene | Activity (relative percentage) | |
Euchro matin | Heterochromatin | |
hsp2 6 w+ | 100% 100% | 31% 8% |
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