Explain the difference between dominant and recessive genes, and provide an example of each one.

For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent. An individual with one dominant and one recessive allele for a gene will have the dominant phenotype.

The two copies, called alleles, can be slightly different from each other. ... For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent. An individual with one dominant and one recessive allele for a gene will have the dominant phenotype.

it would lead to upper respiratory infections and pneumonia.