Genes make up segment of dna.. segments of dna make up chromosome..
So you and you sibling come from same set of parents (assuming).. so the 2 half set of chromosome, one from each parent, is common.. the difference here would be which segments of dna from each chromosome set is dominant giving the variation between the siblings.
The similarity between banana and human genetics material could come from the common ancestor that we shared eons ago which allow for similar built when it comes to cellular structure
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