This all depends on what the parents genotypes are. So yes and no. For example if both parents were of the same recessive hair colouring, say ginger, then all the offspring would be ginger as both these parents would be pure breeding or homozygous recessive for ginger hair ,which means that they have no other hair colour genes in their genotypes. There are many examples that I could give but just one more is ,say , two dark haired parents ,both of whom are heterozygotes in genotype could have and will most likely have dark haired offspring ,can produce a fair haired child if both these parents are carriers for fair hair. It is and can be complicated . Like I said it depends on parental genotypes. This means what the parents genomes contain in the way of hair colour alleles and recessiveness and dominance.
