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Joel Jara Cano
R = Dominant allele / Left thumb above
r = Reccessive allele / Right thumb above
EXPLANATIONWhen people join their hands, some of them put their left thumb over the right one, while the other ones do it the other way around.
It is not a single genetic trait. It is the clearest sample that shows that dominant is not always common.
Father´s side
RR Rr
Rr
rr rr
rr rrRr
Rr rr
autosomal
dominant heredityME
Mother´s side