Final answer:
When two individuals of average IQ and heterozygous for each of the gene pairs have children, the children could inherit a wide range of IQ phenotypes.
Step-by-step explanation:
In the case of IQ phenotypes, intelligence is influenced by multiple genes and environmental factors, making it a complex trait to predict. However, if two individuals of average IQ and heterozygous for each of the gene pairs have children, the children could inherit a wide range of IQ phenotypes. Genes related to intelligence are polygenic, meaning they involve multiple genes. Each gene can have different versions called alleles. Some alleles may contribute to higher intelligence while others may contribute to lower intelligence. When two individuals with average IQ have children, the combination of alleles they pass on can result in a variety of IQ phenotypes in their children, which can range from below average to above average.