Yes, it is quite possible. It does require both parents to have AO(+-) genotypes, which is somewhat rare, however.
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yes because it might be in your generations genes\traits before.I'm curly haired but none of my parents have curly hair : )
The great-grand child to parents who immigrated from Japan,
its likely but might not the chances of the shild not having a widows peak are 1/16 you can better know these odds if you know the parents genotype or genetic makeup.
I believe the chances of having the same birthday as one of your parents is: 1 out of 183 and the chances of having the same birthday as both parents is: 1 out of 133,225
The child will have the disorder, only if the recessive allele from both the parents is transferred to the child. Therefore, the probability is 1/4.