APFIVE A trait is determined by three independently assorting genes, and the parents are heterozygous for all three genes. The dominant phenotype is expressed in offspring that inherit a dominant allele at two or more of these loci. If the observed probability of an offspring displaying the dominant phenotype is $$\frac{27}{32}$$, which of the following conclusions is best supported?
The result suggests that each gene contributes an equal $$\frac{1}{2}$$ chance for the dominant trait, thereby invalidating the need for multi-gene interaction.
The calculated probability of $$\frac{27}{32}$$, derived from summing the probabilities of obtaining exactly two or all three dominant alleles, confirms the polygenic inheritance model.
This probability demonstrates that dominant traits are always expressed in heterozygous conditions regardless of the number of genes involved.
A probability of $$\frac{27}{32}$$ indicates that the trait is controlled by a single gene with complete dominance, contradicting the polygenic model.
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