Based on the macroscopic views of the three substances, which is most permeable? gravel sand silt impossible to tell

Gravel

Explanation:

Gravel is a material that has high permeability. Gravel is widely used as a material for paving, because it is a material of lower cost offering savings for construction, for this reason, it is easily found in parking lots, bicycle paths, sidewalks, among others. Its permeability allows that when a liquid reaches it, it can drain through the gravel pores very easily.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)