This week on Petri Dish Sean and Nathan dive into the apparently controversial topic of biological sex. In this part 1 of a two part discussion, Sean and Nathan talk about the biological basis for the concepts of 'male' and 'female' in non-human organisms ranging from yeast to plants to reptiles. They bring up different kinds of chromosomal systems, weirdos like the platypus and clownfish, and whether climate change could turn more sea turtles into ladies!In this episode we feature a promo for another podcast, Just the Zoo of Us. If you like animal facts, check them out! https://www.justthezooofus.com/Please contact us if you have any questions or feelings about the episodes! You can reach us on twitter @dishpodcast or by email petridishpod -at- gmail.com. We also have a patreon in case you want to sponsor the work we are doing! patreon.com/petridish .References:https://www.sciencedirect.com/science/article/pii/S0016648015002737https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2413164/#!po=0.735294https://ctswordtail.weebly.com/blog/sex-determination-in-platyfish-and-swordtailshttps://www.ncbi.nlm.nih.gov/pubmed/12900561https://www.ncbi.nlm.nih.gov/pubmed/21392300https://www.nature.com/articles/6801068https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692900/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1838700/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2679206/https://hortnews.extension.iastate.edu/2009/2-4/monoecious.htmlhttps://link.springer.com/article/10.1007/s11160-009-9123-4https://www.sciencedirect.com/science/article/pii/S0044848602000571https://www.sciencedirect.com/science/article/pii/S1546509808601132https://www.nature.com/articles/nature14574https://royalsocietypublishing.org/doi/full/10.1098/rspb.2016.2576