🚀 go-pugleaf

In the biology text I used in college, it was mentioned that there is a
genetic condition which causes the absence of skin hair, and that in some
women this can have a sort of patchwork appearance due to different
expression of the X-chromosome.  In women, one of the two X-chromosomes
is not needed, and remains bundled up.  (The unused chromosome is easily
seen using staining and a microscope.  Used as a test for gender, in those
cases where it is uncertain.)  Because the defective gene is on the X-
chromosome, expression of skin hair reveals something like a genetic
mosaic, in that it reveals which X-chromosome is being expressed where.