Anyone know a good holiday song to a biology theme?

I am doing an extra credit ignment, which requires me to write a holiday tune with biology lyrics. So, I was looking from something catchy to the tune of Jingle Bell Rock, Jingle Bells, Silent Night, any holiday song, really. And the subject would be about mitosis, meiosis, cancer cells, cell parts, scientific method, alleles..... any freshman biology material. If you have any ideas let me know! Thannks