Siblings may share similarities but are not identical because they have different genetic makeup due to the segregation of chromosomes in gametic parental cells and the process of crossing over.
Siblings are not genetically identical because the gametes in the parent suffer a process known as chromosome segregation, which involves the segregation of different homologous chromosomes in the germinal cells before the process of fertilization.
Moreover, the formation of the gamete cells also suffer another process that increases the genetic variation of the resulting meiotic cells called crossing over or recombination, which is well known to change genetic fragments between non sister chromatids.
Therefore, with this data, we can see that siblings are not genetically identical but share similarities because the zygote derives from cells having different genetic makeup due to the segregation of chromosomes and crossing over.
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