When two dihybrid individuals are mated, this is called a dihybrid cross. Even though the parents of a dihybrid cross have the same genotype and phenotype, their offspring could show any one of 9 different genotypes and 4 different phenotypes. The phenotypic ratio of offspring produced from a dihybrid cross is 9:3:3:1. To unlock this lesson you must be a Study.com Member.
Sounds are heard by the ear as either being loud or soft. The loudness of a sound in measured in decibels. Decibels refer to the energy produced by that sound. A human can hear sounds ranging from 0.1 decibels, which is very soft, to sound which measure 120 decibels. Younger people can often hear lower volumes better than older people.
1 hyperresonance, a loud, booming sound, is usually heard over a hyperinflated lung, as in patients with emphysema. 2  dullness, a soft, high-pitched, thudlike sound, can generally be heard over dense organs, such as the liver. 3  flatness, a soft-high-pitched sound, is generally heard over bones, muscles, and tumors.