The Y chromosome looks like a mistake, but its story is actually super interesting. Thank you everyone who watches.

Sources:

Maloy, S., Hughes, K., & Tyler-Smith, C. (2013). Y Chromosome (Human). In Brenner's Encyclopedia of Genetics. essay, Elsevier.

Jennifer F Hughes, Helen Skaletsky, Natalia Koutseva, Tatyana Pyntikova and David C Page. (2015) Sex chromosome-to-autosome transposition events counter Y-chromosome gene loss in mammals. Genome Biology

Wilson, J., Staley, J.M. & Wyckoff, G.J. Extinction of chromosomes due to specialization is a universal occurrence. Sci Rep 10, 2170 (2020). https://doi.org/10.1038/s41598-020-58...

Editors, B. D. (2019, June 20). Homologous chromosomes: Definition & examples. Biology Dictionary. Retrieved December 1, 2022, from https://biologydictionary.net/homolog...

Singer, E., & Quanta Magazine moderates comments to facilitate an informed, S. (2020, May 18). The incredible shrinking sex chromosome. Retrieved December 1, 2022, from https://www.quantamagazine.org/the-in...

Music: Fly Chicken by Alexander Nakarada
Free download: https://filmmusic.io/song/9832-fly-ch...
License (CC BY 4.0): https://filmmusic.io/standard-license
Artist website: https://www.serpentsoundstudios.com/