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Sources:
https://ghr.nlm.nih.gov/chromosome/Y
http://evolution.berkeley.edu/evolibrary/news/140513_ychromosome
http://www.sciencemag.org/news/2014/04/y-chromosome-more-sex-switch
https://ghr.nlm.nih.gov/primer/basics/howmanychromosomes
https://www.genome.gov/27557513/the-y-chromosome-beyond-gender-determination/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4120474/
http://www.ncbi.nlm.nih.gov/pubmed/24759411
http://www.nature.com/nature/journal/v508/n7497/full/nature13151.html
https://ghr.nlm.nih.gov/gene/SRY
Is the Y Chromosome Disappearing?
Scientists know that the Y chromosome has been shrinking in size over millions of years, but recent studies suggest that it has more important genes, besides the ones that cause biological maleness.