Simplify the following text for a Grade 12 native English-speaking person.
Original: The effect is one-way : germ cells produce somatic cells and are not affected by anything the somatic cells learn or therefore any ability the body acquires during its life .
Simplified: The effect is one-way : germ cells produce somatic cells , and more germ cells ; the germ cells are not affected by anything the somatic cells learn or any ability the body acquires during its life .