This is not an original idea, i saw someone else suggest it on the original thread, but I noticed that despite it being a very popular idea, it was not included so far.
The idea is that there could be a way to pick certain genes as only being able to be passed down to (or maybe only being dominant on) males or females. Such as, selecting big nose as only being passed down to/dominant on females so then the males children either don’t get it or it’s automatically recessive.