How are these unique sex chromosomes formed ... mice had a mottled coat color when they were heterozygous for the sex-linked genes involved in coat color. At the time, several X-linked genes ...

is critical for cell viability and chromosome stability (Cell 2001, 107:67-77). Hemann et al. crossbred telomerase-deficient mice having short telomeres with mice heterozygous for telomerase activity ...