Why do siblings look different even though they have the same parents?

When siblings look different despite having the same parents, it's due to the genetic variation that occurs during the process of genetic recombination. During the formation of reproductive cells, or gametes, the genetic material from each parent combines and shuffles, leading to unique combinations in each child. This process results in different traits being expressed, causing siblings to look distinct from one another. Factors such as dominant and recessive genes also contribute to this genetic variation, leading to the diverse physical appearances seen in siblings.

Understanding genetic variation helps us appreciate the uniqueness of each individual and the fascinating science behind inheritance and genetic expression.