Which of the following is an example of an informal definition? Genetics - that is, the genes you've inherited - may play a role in how your ears react to loud sounds.

The use of genetics is often applied in studies of plant species and improvement. Horticulturalists aim to breed disease-resistant plants by changing their genetic traits. Genetically modified plants are controversial as sources of food crops.

Merriam Webster's Dictionary defines genetics (noun) as "the scientific study of how genes control the characteristics of plants and animals."

Geneticist J. B.S. Haldane makes an interesting point: "I am quite sure that our views on evolution would be very different had biologists studied genetics and natural selection before and not after most of them were convinced that evolution had occurred."