DREDO
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Barbara has curly hair. Her genotype for this trait is CC. What do you infer from this?

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devinr10
Barbara has dominant alleles for curly hair because CC is all capitals. and  The two alleles of the gene are homozygous dominant
Drian
Since she has curly hair, it's a dominant trait. 
CC is upper case hinting at both are dominant traits. Hence, she has dominant traits, and not recessive.