Question

Organisms with this trait synthesize a properly spliced transcript of the transformer gene by expressing the Sxl (“S-X-L”) protein. Wolbachia (“woll-BACK-ee-uh”) infection drives up the number of mosquitoes that possess this trait, since only they are diploid. (20[3])In mammals with this trait, (20[1])dosage compensation is controlled by (20[1])two long (20[1])noncoding RNAs that coat DNA called (20[1])Tsix (20[1])(“T-six”) and (*) Xist (10[1])(“X-ist”). Only Drosophila with this trait can be heterozygous (10[1])for eye color. (10[3])Mary Lyon (10[1])explained how calico cats with this (10[1])trait (10[1])form (10[2])Barr (10[1])bodies. Humans with this trait are represented by circles on pedigrees (10[2])and can be (10[1])unaffected carriers of the allele for color blindness. For 10 points, having two X and no Y chromosomes corresponds (10[1])to what biological (10[2])trait in humans? (10[2])■END■ (10[9])

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