The only child of myopic parents has normal vision. Identify the genotypes of the parents and the child.

Let’s designate the gene that causes the development of normal vision in a person as k, then the gene that leads to the development of myopia will be designated as K.

A child with normal vision will have the kk genotype, because homozygosity is a prerequisite for a recessive phenotype. Such a genotype is formed as a result of the fusion of parental gametes carrying genes for normal vision k.

Therefore, both myopic parents of this child are heterozygous – Kk.