Question

Allen and andrew both have the same biological parents. Why do they not resemble either of there parents

Answer 1

C) Each child receives only half of each parent’s genes.

Step-by-step explanation:

In sexual reproduction, the offspring receives half the genetic information from their mother and half from their father. The offspring so formed will have a different combination of genes from the parents. So, the siblings are not identical to their parents.

Answer 2

This can be because of their genetics. The siblings may not have inherited their parents looks, but maybe they inherited their grandparents looks, or even their aunts looks. This is all due to genetics. It's sort of the same thing, when two caucasian parents have an african-american child. That would be because somewhere along the family tree someone was african-american.
Anyways, I hope this helps!