A boy's IQ is not determined solely by his mother's genetics, but is affected by a combination of factors, including genetic factors, environmental factors, early education, nutritional status, family atmosphere, etc.

1. Genetic factors: Human IQ is indeed influenced by genetics, but it doesn't depend solely on the mother. Heredity is a complex process that involves the interaction of multiple genes. The combination of genes in both parents plays a role in a child's intellectual development.

2. Environmental factors: The environment in which a child grows up is crucial for IQ development. Abundant stimulation, good educational resources, and a safe and stable living environment all contribute to the improvement of children's intelligence.

3. Early Education: In the early stages of a child's development, receiving proper education and nurturing can stimulate brain development, improve cognitive abilities and problem-solving skills.

4. Nutritional status: Adequate and balanced nutrition is the basis for the normal development of the brain. For example, proteins, vitamins, minerals, etc., have an important impact on brain function and development.

5. Family Atmosphere: A harmonious and positive family atmosphere can cultivate children's good character and emotional management skills, which is conducive to their intellectual development.

To sum up, a boy's IQ is shaped by a combination of factors, and it cannot simply be assumed that it is mainly inherited from the mother. Parents should create a good environment for their children's growth, pay attention to early education and nutritional supply, and create a warm family atmosphere to promote their children's all-round intellectual development.

This article is only for health science popularization and does not constitute medication or medical guidelines, it is recommended to seek medical attention in time if you have health problems.