It's like having a bag 1 filled with equal quantities of capsicums, cherries, and apples, then selecting the top reddest 25% of bag 1 and moving them to bag 2.
You will have much less variability of fruit type in bag 2 because you used color selection to fill it (apples and capsicums come in three colors at will be selected 1/3rd the rate of cherries).
That's the whole point of sexual vs natural selection.
It's like having a bag 1 filled with equal quantities of capsicums, cherries, and apples, then selecting the top reddest 25% of bag 1 and moving them to bag 2.
You will have much less variability of fruit type in bag 2 because you used color selection to fill it (apples and capsicums come in three colors at will be selected 1/3rd the rate of cherries).
That's the whole point of sexual vs natural selection.