I am not sure why people are being so difficult and suggesting dumb things like cutting China pride cables and soldering new ends on them. It's no wonder why so many house fires happen and consoles blow their fuses.
The Sega MK-1602 power supply is what shipped with the model 1 Genesis. Go on eBay and buy one. It takes 10 seconds. Do not use Amazon. Never use 3rd party or multi-format adapters. They are cheap junk and will burn out (or burn your house down). I had a cheap NES one 10 years ago. It melted and shorted out my power strip and would have started a fire if I wasn't sitting right there to smell and see the smoke.
I always use official OEM hardware and it never fails and always works. Having the original hardware also improves the value of the console when sold. There is absolutely no sense in using Chia pride junk with narrow low gauge wire and quality that will not last beyond a year. They are cheap for a reason.