Final answer:
The probability that Greg and Dwight's child will have hair just like one of them can't be determined without knowing their specific genotypes due to the nature of incomplete dominance. In incomplete dominance, the heterozygote shows an intermediate phenotype between the two parent's phenotypes.
Step-by-step explanation:
When analyzing genetics and inheritance patterns, the scenario described involves Greg and Dwight, who have alleles for a hair form gene with incomplete dominance. Unlike complete dominance where a dominant allele completely masks the effect of a recessive allele, in incomplete dominance, the heterozygote exhibits an intermediate phenotype. In the case of hair form, if Greg and Dwight each have different homozygous conditions (one with straight hair, the other with curly hair), their child would have an intermediate (wavy) hair form if they inherited one allele from each parent.
However, if we are interested in the probability that their child will have hair just like Greg's or Dwight's, the answer depends on the specific genotypes of Greg and Dwight. Without additional information it is impossible to determine the exact probabilities. But generally, incomplete dominance results in three possible genotypes and phenotypes when including both homozygotes and the heterozygote. Without knowing Greg's or Dwight's specific genotypes, we can't apply a simple Mendelian ratio to determine the likelihood that their child will share the same hair type as either parent.