Human hair type is transmitted as an (autosomal) incomplete dominant trait, so if curly-haired Paul marries straight-haired pam, percent of their children that would have curly hair is 0%.
Incomplete dominance is a form of gene interaction where both alleles of gene at a locus are partially expressed, resulting in an intermediate or different phenotype. It is also called partial dominance.
This pattern of inheritance is described as incomplete dominance because neither of the alleles is completely dominant over the other as both alleles can be seen at the same time. For example: allele for red flowers is incompletely dominant over the allele for white flowers, so Red + white = pink.
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