Mass Effect Upgrading Points for Sniper Rifles

I'm playing the first Mass Effect. I played it before but didn't complete it, and am going through it again. I enjoy playing games stealthily and attacking from distance if it's an option, so I chose my character to do that (I can't remember the name of it in the game). I specifically and purposely chose that, yet I am not at all able to upgrade his talent points for sniper; I can upgrade other things, but sniper is 1 of the few I can't upgrade.

Can anyone help me with it?

Solution 1:

As Infiltrator you have to put 5 points into pistol before you can put points into snipers.

This is true for several Infiltrator talents. Namely:

• Snipers → Unlocked at Pistols 5
• Fitness → Unlocked at Tactical Armor 6
• Damping → Unlocked at Electronics 4
• First Aid → Unlocked at Decryption 7

Here is a link to the Infiltrator wiki if you have any further questions about how the skills work.