Final answer:
Both nearsighted parents have two recessive alleles for myopia, and therefore all of their offspring would inherit the recessive alleles leading them to be nearsighted as well.
Step-by-step explanation:
Nearsightedness, or myopia, is a condition most commonly known to develop in school-age children and can have a genetic predisposition. Given that nearsightedness is a recessive trait and both parents exhibit the trait, it can be deduced that both parents have two recessive alleles for myopia. Therefore, they can only pass on the allele for nearsightedness to their offspring.
When two nearsighted (recessive) parents have children, all of their offspring will similarly inherit two copies of the recessive allele – one from each parent – resulting in the expression of nearsightedness. To illustrate, consider the Punnett square, where 'n' represents the recessive allele for nearsightedness. As both parents are nn (nearsighted), all their children will receive an 'n' from each parent (nn), indicating that each child will be nearsighted. Therefore, all four children of nearsighted parents are expected to be nearsighted as well.