Way back in the dark ages when I was in high school (the 70s) we had a project to select the people required to colonize another planet. I argued intensely with my group about a fundamental error they were making. They chose mostly science and engineering types. Not one farmer was included. A modern farmer doesn't just stick seeds in the ground and ride around in a tractor. He also analyzes the soil to know what should be added for a healthy crop along with a lot of other "sciency" things. On another planet, that is especially important.
When it came time to present our choices to the class, I immediately said that our group would be dead within a year due to starvation. Surprisingly, none of the other groups bothered to include a farming expert.
Also, I argued that every essential skill had to be duplicated. You didn't want to have just one medical doctor because shit happens.