Question

how do sexual reproduction leads to similarities as well as variations

Answer 1

This is because, the kids qualities are given by the parents. If the parents are tall then there's a high chance that there kid is going to be tall as well. These are the type of Variations that occur

Answer 2

Sexual reproduction leads to similarities because during the mating process the genes or DNA are also transported from one body to another by which the new born child has some similarities of the parents.