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.
Loudness or amplitude is measured in decibels and it is marked or notated using dB to designate decibels. Keeping in mind that at 85 dB hearing loss can begin, normal everyday conversation is at approximately 70 dB and loud talking is about 90 dB.This is one of the reasons why loud and boisterous people bother us so much.oudness or Amplitude â Science, specifically audiology, knows that the difference between the threshold of human hearing (0 dB) and the threshold of pain (120 dB) and hearing loss occurs at approximately 120 decibels.