Help keep One Green Planet free and independent! Together we can ensure our platform remains a hub for empowering ideas committed to fighting for a sustainable, healthy, and compassionate world. Please support us in keeping our mission strong.

While it’s a common belief that sex is determined by a single gene in humans and other animals, this notion has been challenged by claims that some species, like platyfish, require multiple genes to determine sex. To better understand these complexities, a review delved into the topic and discovered that these claims typically refer to abnormal or transitional situations, such as hybrids between two species with different sex-determining systems.

In mammals, the SRY gene on the Y chromosome acts as the “master switch” for sex determination. This system ensures a 1:1 ratio of male and female offspring. However, other vertebrates exhibit a vast array of sex-determining systems, with some species appearing to have multiple sex genes.

Aquarium fish, such as platyfish and sea bass, frogs, and lizards seem to exhibit more complex systems. The platypus, for instance, carries five X and five Y chromosomes, raising questions about sex determination in such species. These exceptional cases seem to defy the expectation of a single sex gene producing a stable system.

When examining species without an apparent single master switch gene, it’s common to refer to “polygenic sex.” However, the analysis shows that these examples often represent abnormal or transitional situations. In some cases, multiple sex genes are detected but ultimately control different steps of the same pathway regulated by a single master gene.

Transitional systems, like those seen in sea bass and European frogs, may show signs of a new system gradually replacing an old one. Moreover, hybrids between two species can reveal multiple genes with significant effects on sex determination, but in the long run, there is strong selection for one gene to dominate, resulting in a single-gene system and a 1:1 sex ratio.

Understanding these complexities in sex determination can help researchers and conservationists better manage animal populations and contribute to our knowledge of genetic diversity. We encourage readers to explore the fascinating world of sex determination and appreciate the myriad ways in which nature finds balance. By gaining a deeper understanding of these processes, we can work towards protection and maintaining biodiversity, ultimately benefiting the planet and its inhabitants.

Tiny Rescue Animal Collection

Ahisma Tee By Tiny Rescue: Animal Collection

Related Content:

Easy Ways to Help the Planet:

  • Eat Less Meat: Download Food Monster, the largest plant-based Recipe app on the App Store, to help reduce your environmental footprint, save animals and get healthy. You can also buy a hard or soft copy of our favorite vegan cookbooks.
  • Reduce Your Fast Fashion Footprint: Take initiative by standing up against fast fashion Pollution and supporting sustainable and circular brands like Tiny Rescue that raise awareness around important issues through recycled zero-waste clothing designed to be returned and remade over and over again.
  • Support Independent Media: Being publicly funded gives us a greater chance to continue providing you with high-quality content. Please consider supporting us by donating!
  • Sign a Petition: Your voice matters! Help turn petitions into victories by signing the latest list of must-sign petitions to help people, animals, and the planet.
  • Stay Informed: Keep up with the latest news and important stories involving animals, the environment, sustainable living, food, health, and human interest topics by subscribing to our newsletter!
  • Do What You Can: Reduce waste, plant trees, eat local, travel responsibly, reuse stuff, say no to single-use plastics, recycle, vote smart, switch to cold water laundry, divest from fossil fuels, save water, shop wisely, Donate if you can, grow your food, volunteer, conserve energy, compost, and don’t forget about the microplastics and microbeads lurking in common household and personal care products!