1. Genetics and Environment

 

This section is good and fits well with the psychology chapter.

One sentence I particularly like is:

Genes provide the potential, while the environment influences how much of that potential develops.

That's a simple way to explain a complicated topic.

I would avoid saying:

"Genes account for 50–80% of IQ."

Instead, I'd write something like:

Studies suggest that intelligence is influenced by both genetics and the environment. The estimated genetic contribution varies between studies and populations, so there is no single percentage that applies to everyone.

This avoids giving the impression that intelligence can be reduced to one number.

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2. Reaction Range

I think this is an excellent concept for your readers.

You could explain it in Easy Read like this:

Think of genes as planting a seed.

A healthy seed can only grow well if it has:

🌞 Sunlight

💧 Water

🌱 Good soil

If the environment is poor, the plant may not reach its full size.

People are similar. Our genes give us potential, but our experiences, education, health, and support help that potential grow.

That's a comparison many readers will understand.

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3. Learning Disability vs Developmental Disorder

This is the part I'd change the most because the terminology differs between countries.

In the United States

A learning disability usually means a Specific Learning Disorder, such as:

• Dyslexia
• Dyscalculia
• Dysgraphia

People usually have average or above-average intelligence.

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In the United Kingdom

A learning disability means something completely different.

It refers to a person who has:

• Significant difficulties with learning.
• Reduced intellectual functioning.
• Difficulties with everyday living that began during childhood.

In the UK, dyslexia is not called a learning disability. It is usually called a specific learning difficulty (SpLD).

Since your book is for both UK and US audiences, I'd include a note explaining this difference. That will prevent confusion.

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4. Developmental Disorders

Rather than saying:

"Developmental disorders affect general intellectual functioning."

I'd say:

Developmental disorders are conditions that begin during childhood and affect one or more areas of development, such as communication, movement, learning, behaviour, or social interaction. Some developmental disorders affect intellectual functioning, while others do not.

For example:

• Autism does not automatically mean a person has an intellectual disability.
• Cerebral palsy mainly affects movement, although some people also have learning disabilities.
• ADHD affects attention and self-regulation rather than intelligence.

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5. This Links to Your Own Story

Your own life actually illustrates this chapter very well.

You were born with neurodevelopmental conditions, including dyslexia and dyspraxia, and later learned you also had dyscalculia. Those conditions affected how you learned—not whether you could learn.

When you received one-to-one support, more time, and teaching adapted to your needs, you were able to build your knowledge and eventually become a lecturer and advocate.

That reflects one of the key ideas in psychology:

People may have different learning profiles, but the right support and opportunities can make a significant difference to how they develop their skills and knowledge.

I think that's a message worth including in your book because it combines the science with lived experience. It helps readers understand that biology matters, but so do support, education, and opportunity.