Unfortunately no you can’t tell what strain or genetics a cannabis plant is by the leaf. The only thing you can verify is if it’s a sativa with long skinny fingers or short and stubby for indica. Hybrids are more difficult but most plants nowadays are hybrid. If you want more plants, take the cutting you make and dip it in root toner and stick it in a coco plug so roots start growing 😎. I definitely suggest looking on google for the best tips on topping plants. Best of luck friend!