Actually, inbreeding produces the effects, even if the parents' genes are relatively strong. It's the lack of diversification in the genes, as well as some more complicated genetic causes, which cause the inbreeding effects.
However that's not what the topic is about. The topic at hand is whether it's ok to have a crush on someone who reminds you of your sister, and the answer I'd give is yes, so long as you're not using her as some sort of proxy for some seriously squicky unresolved feelings for your sister. Otherwise, it's perfectly normal.
is it normal to have a crush on a girl that reminds you of your sister
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Actually, inbreeding produces the effects, even if the parents' genes are relatively strong. It's the lack of diversification in the genes, as well as some more complicated genetic causes, which cause the inbreeding effects.
However that's not what the topic is about. The topic at hand is whether it's ok to have a crush on someone who reminds you of your sister, and the answer I'd give is yes, so long as you're not using her as some sort of proxy for some seriously squicky unresolved feelings for your sister. Otherwise, it's perfectly normal.