Day 353 (Yq12): three days of heterochromatin; evolution of the Y


Day 353 has no┬áprotein-coding genes (browser view). The rest of Chromosome Y is constitutive heterochromatin – the longest such stretch in the genome.

Not all animals use an X-Y sex determining system. The Y chromosome is unique to mammals, and the ancestral relationship between X and Y can still be detected. As the two diverge, the Y continues to accumulate mutations that it can’t fix the way the X chromosome can.

Click here to see all 8175345 letters of Day 353.

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