The image shows two siblings with their grandparents.

Question

Which best explains why the siblings look more like each other and less like their grandparents?

The siblings are more closely related to each other than they are to their grandparents.
Each sibling is more closely related to the grandparents than to the other sibling.
The grandparents do not have any shared characteristics in common with the siblings.
The grandparents do not have any shared characteristics with one another.

Answer 1

The best explanation for why the siblings look more like each other and less like their grandparents is: The siblings are more closely related to each other than they are to their grandparents.

Siblings share a greater proportion of their genetic material with one another (typically around 50%) than they do with their grandparents, who share approximately 25% of their genetic makeup with each grandchild. This closer genetic relationship results in siblings looking more alike than they do when compared to their grandparents.