Why does the platypus have ten sex chromosomes?

The platypus isn't just weird for being duck-billed, venomous and a mammal that lays eggs—it has weird genetics too. Most mammals have two sex chromosomes, but the platypus has ten! Why? How do they work? And do these extra sex chromosomes make the platypus extra sexy? Watch to find out! More about quirky evolution: http://www.nova.org.au/quirky-evolution Explore Nova: http://nova.org.au Facebook:   / scienceforcurious   Twitter:   / novacurious   -Credits- Special thanks to Professor Jenny Graves for helping us create this video. Read about Jenny: http://www.nova.org.au/person/profess... Music Track: Eve Catani - Fizzlenizzle Source:   / eve-catani-fizzlenizzle   Music license: Creative Commons Attribution NonCommercial ShareAlike Platypus skeleton photo Author: Peter Halasz Source: https://commons.wikimedia.org/wiki/Fi... Photo license: Creative Commons Attribution ShareAlike