Question

why dont siblings with the same parents have the exact same traits? each sibling receives the same genes from each parent, but these genes are randomized as each sibling grows up, resulting in different expressions of traits. each sibling receives the same genes from each parent, but these genes are interpreted differently by their cells, resulting in different expressions of traits. each sibling randomly receives two versions of each gene from each parent. this allows for various combinations of genes that express traits differently.

Explanation:

Genes are passed from parents to offspring. Each parent has two versions (alleles) of each gene. When gametes (sperm and egg) are formed, the alleles segregate randomly. Each sibling randomly receives one allele from each parent for each gene. This random assortment of alleles (versions of genes) during sexual reproduction leads to different combinations of genes in each sibling. Different gene combinations result in different expressions of traits. The first option is incorrect because genes are not "randomized as each sibling grows up" - the genetic variation is due to the initial combination of alleles received from parents. The second option is also incorrect as it's not about cells interpreting the same genes differently in a non - genetic way; it's about the different combinations of alleles (gene versions) received.

Answer:

Each sibling randomly receives two versions of each gene from each parent. This allows for various combinations of genes that express traits differently.