With the new skin tones added with Monday’s Sims 4 Game Update comes issues with the genetics system in the game. Players are reporting a problem with genetics selector in the game, which is preventing skin tones from converting properly.
When using the genetics tool in Create-a-Sim, or when having a baby, the offspring are not generating proper skin genetics when parents have different skin tones. Maxis is aware of the issue, so hopefully a fix for this problem arrives soon.
Hi Simmers, we are aware of the genetics selector issue in The Sims 4, and we’re investigating it.🔍
— The Sims (@TheSims) December 9, 2020