Complex sentence: This is incorrect, since a child receives its genetic makeup entirely and exclusively from its parents--there is no generation skipping in genetic material: any genetic material from ancestors other than (before) the parents must have passed through the parents.
Split into simpler sentences: This is incorrect, since a child receives its genetic makeup exclusively from its parents. There is no generation-skipping in genetic material: any genetic material from earlier ancestors than the parents must have passed through the parents.