:

1. XX-XO mechanism: Found in insects like the Grasshopper, where males have only one X chromosome (XO) and females have a pair (XX) .
2. ZZ-ZW mechanism: Found in Birds, where females have dissimilar chromosomes (ZW) and males have similar chromosomes (ZZ) .
3. Haplo-diploidy mechanism: Found in insects like Honey bees (and Wasps), where males are haploid and females are diploid .
4. ZZ-ZO mechanism: While not explicitly detailed in the text, by elimination and standard classification in this context, Moths fit the remaining slot (some Lepidoptera exhibit ZO mechanisms).